<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://corporate.comcast.com/20181231" xmlns:cmcsa="http://corporate.comcast.com/20181231" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:import namespace="http://fasb.org/srt/2018-01-31" schemaLocation="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2018-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2018-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-roles-2018-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2018-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-types-2018-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2017-01-31" schemaLocation="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/currency/2017-01-31" schemaLocation="http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2018-01-31" schemaLocation="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/exch/2018-01-31" schemaLocation="https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/naics/2017-01-31" schemaLocation="http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2018-01-31" schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmcsa-20181231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmcsa-20181231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmcsa-20181231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmcsa-20181231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:roleType id="BasisOfPresentationAndSummaryOfSignificantAccountingPolicies" roleURI="http://corporate.comcast.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies">
        <link:definition>2101100 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails" roleURI="http://corporate.comcast.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails">
        <link:definition>2401401 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingencies" roleURI="http://corporate.comcast.com/role/CommitmentsAndContingencies">
        <link:definition>2117100 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderProgrammingLicenseAgreementsAndOperatingLeasesDetails" roleURI="http://corporate.comcast.com/role/CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderProgrammingLicenseAgreementsAndOperatingLeasesDetails">
        <link:definition>2417403 - Disclosure - Commitments and Contingencies (Minimum Annual Commitments under the Programming License Agreements and Operating Leases) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesNarrativeDetails" roleURI="http://corporate.comcast.com/role/CommitmentsAndContingenciesNarrativeDetails">
        <link:definition>2417402 - Disclosure - Commitments and Contingencies (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesRentalExpenseDetails" roleURI="http://corporate.comcast.com/role/CommitmentsAndContingenciesRentalExpenseDetails">
        <link:definition>2417404 - Disclosure - Commitments and Contingencies (Rental expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesTables" roleURI="http://corporate.comcast.com/role/CommitmentsAndContingenciesTables">
        <link:definition>2317301 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatingFinancialInformation" roleURI="http://corporate.comcast.com/role/CondensedConsolidatingFinancialInformation">
        <link:definition>2119100 - Disclosure - Condensed Consolidating Financial Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails" roleURI="http://corporate.comcast.com/role/CondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails">
        <link:definition>2419404 - Disclosure - Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails" roleURI="http://corporate.comcast.com/role/CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails">
        <link:definition>2419403 - Disclosure - Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails" roleURI="http://corporate.comcast.com/role/CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails">
        <link:definition>2419402 - Disclosure - Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatingFinancialInformationTables" roleURI="http://corporate.comcast.com/role/CondensedConsolidatingFinancialInformationTables">
        <link:definition>2319301 - Disclosure - Condensed Consolidating Financial Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheet" roleURI="http://corporate.comcast.com/role/ConsolidatedBalanceSheet">
        <link:definition>1004000 - Statement - Consolidated Balance Sheet</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetParenthetical" roleURI="http://corporate.comcast.com/role/ConsolidatedBalanceSheetParenthetical">
        <link:definition>1004501 - Statement - Consolidated Balance Sheet (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementOfCashFlows" roleURI="http://corporate.comcast.com/role/ConsolidatedStatementOfCashFlows">
        <link:definition>1003000 - Statement - Consolidated Statement of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementOfChangesInEquity" roleURI="http://corporate.comcast.com/role/ConsolidatedStatementOfChangesInEquity">
        <link:definition>1005000 - Statement - Consolidated Statement of Changes in Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementOfComprehensiveIncome" roleURI="http://corporate.comcast.com/role/ConsolidatedStatementOfComprehensiveIncome">
        <link:definition>1002000 - Statement - Consolidated Statement of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementOfComprehensiveIncomeParenthetical" roleURI="http://corporate.comcast.com/role/ConsolidatedStatementOfComprehensiveIncomeParenthetical">
        <link:definition>1002501 - Statement - Consolidated Statement of Comprehensive Income (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementOfIncome" roleURI="http://corporate.comcast.com/role/ConsolidatedStatementOfIncome">
        <link:definition>1001000 - Statement - Consolidated Statement of Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DocumentAndEntityInformation" roleURI="http://corporate.comcast.com/role/DocumentAndEntityInformation">
        <link:definition>0001000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShare" roleURI="http://corporate.comcast.com/role/EarningsPerShare">
        <link:definition>2106100 - Disclosure - Earnings Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareDetails" roleURI="http://corporate.comcast.com/role/EarningsPerShareDetails">
        <link:definition>2406402 - Disclosure - Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareTables" roleURI="http://corporate.comcast.com/role/EarningsPerShareTables">
        <link:definition>2306301 - Disclosure - Earnings Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlans" roleURI="http://corporate.comcast.com/role/EmployeeBenefitPlans">
        <link:definition>2113100 - Disclosure - Employee Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansDeferredCompensationPlansDetails" roleURI="http://corporate.comcast.com/role/EmployeeBenefitPlansDeferredCompensationPlansDetails">
        <link:definition>2413402 - Disclosure - Employee Benefit Plans (Deferred Compensation Plans) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansInformationOnOurPensionBenefitPlansDetails" roleURI="http://corporate.comcast.com/role/EmployeeBenefitPlansInformationOnOurPensionBenefitPlansDetails">
        <link:definition>2413403 - Disclosure - Employee Benefit Plans (Information On Our Pension Benefit Plans) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansNarrativeDetails" roleURI="http://corporate.comcast.com/role/EmployeeBenefitPlansNarrativeDetails">
        <link:definition>2413404 - Disclosure - Employee Benefit Plans (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansTables" roleURI="http://corporate.comcast.com/role/EmployeeBenefitPlansTables">
        <link:definition>2313301 - Disclosure - Employee Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Equity" roleURI="http://corporate.comcast.com/role/Equity">
        <link:definition>2114100 - Disclosure - Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityAggregateShareRepurchasesDetails" roleURI="http://corporate.comcast.com/role/EquityAggregateShareRepurchasesDetails">
        <link:definition>2414404 - Disclosure - Equity (Aggregate Share Repurchases) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityChangesInCommonStockDetails" roleURI="http://corporate.comcast.com/role/EquityChangesInCommonStockDetails">
        <link:definition>2414403 - Disclosure - Equity (Changes in Common Stock) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" roleURI="http://corporate.comcast.com/role/EquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails">
        <link:definition>2414405 - Disclosure - Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityNarrativeDetails" roleURI="http://corporate.comcast.com/role/EquityNarrativeDetails">
        <link:definition>2414402 - Disclosure - Equity (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityTables" roleURI="http://corporate.comcast.com/role/EquityTables">
        <link:definition>2314301 - Disclosure - Equity (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillAndIntangibleAssets" roleURI="http://corporate.comcast.com/role/GoodwillAndIntangibleAssets">
        <link:definition>2112100 - Disclosure - Goodwill and Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillAndIntangibleAssetsAmortizationOfIntangibleAssetsDetails" roleURI="http://corporate.comcast.com/role/GoodwillAndIntangibleAssetsAmortizationOfIntangibleAssetsDetails">
        <link:definition>2412405 - Disclosure - Goodwill and Intangible Assets (Amortization of Intangible Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillAndIntangibleAssetsIntangibleAssetsDetails" roleURI="http://corporate.comcast.com/role/GoodwillAndIntangibleAssetsIntangibleAssetsDetails">
        <link:definition>2412404 - Disclosure - Goodwill and Intangible Assets (Intangible Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillAndIntangibleAssetsNarrativeDetails" roleURI="http://corporate.comcast.com/role/GoodwillAndIntangibleAssetsNarrativeDetails">
        <link:definition>2412403 - Disclosure - Goodwill and Intangible Assets (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillAndIntangibleAssetsScheduleOfChangeInGoodwillDetails" roleURI="http://corporate.comcast.com/role/GoodwillAndIntangibleAssetsScheduleOfChangeInGoodwillDetails">
        <link:definition>2412402 - Disclosure - Goodwill and Intangible Assets (Schedule of Change in Goodwill) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillAndIntangibleAssetsTables" roleURI="http://corporate.comcast.com/role/GoodwillAndIntangibleAssetsTables">
        <link:definition>2312301 - Disclosure - Goodwill and Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://corporate.comcast.com/role/IncomeTaxes">
        <link:definition>2105100 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesComponentsOfIncomeTaxExpenseDetails" roleURI="http://corporate.comcast.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseDetails">
        <link:definition>2405402 - Disclosure - Income Taxes (Components of Income Tax Expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails" roleURI="http://corporate.comcast.com/role/IncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails">
        <link:definition>2405405 - Disclosure - Income Taxes (Components of Net Deferred Tax Liability) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesFederalStatutoryDetails" roleURI="http://corporate.comcast.com/role/IncomeTaxesFederalStatutoryDetails">
        <link:definition>2405403 - Disclosure - Income Taxes (Federal Statutory) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesNarrativeDetails" roleURI="http://corporate.comcast.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>2405404 - Disclosure - Income Taxes (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesReconciliationOfUnrecognizedTaxBenefitsDetails" roleURI="http://corporate.comcast.com/role/IncomeTaxesReconciliationOfUnrecognizedTaxBenefitsDetails">
        <link:definition>2405406 - Disclosure - Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://corporate.comcast.com/role/IncomeTaxesTables">
        <link:definition>2305301 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Investments" roleURI="http://corporate.comcast.com/role/Investments">
        <link:definition>2110100 - Disclosure - Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsEquityMethodInvestmentsDetails" roleURI="http://corporate.comcast.com/role/InvestmentsEquityMethodInvestmentsDetails">
        <link:definition>2410404 - Disclosure - Investments (Equity Method Investments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsInvestmentIncomeLossNetDetails" roleURI="http://corporate.comcast.com/role/InvestmentsInvestmentIncomeLossNetDetails">
        <link:definition>2410403 - Disclosure - Investments (Investment Income (Loss), Net) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsMarketableEquitySecuritiesDetails" roleURI="http://corporate.comcast.com/role/InvestmentsMarketableEquitySecuritiesDetails">
        <link:definition>2410405 - Disclosure - Investments (Marketable Equity Securities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsOtherInvestmentsDetails" roleURI="http://corporate.comcast.com/role/InvestmentsOtherInvestmentsDetails">
        <link:definition>2410406 - Disclosure - Investments (Other Investments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsScheduleOfInvestmentsDetails" roleURI="http://corporate.comcast.com/role/InvestmentsScheduleOfInvestmentsDetails">
        <link:definition>2410402 - Disclosure - Investments (Schedule of Investments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsScheduleOfInvestmentsDetailsCalc2" roleURI="http://corporate.comcast.com/role/InvestmentsScheduleOfInvestmentsDetailsCalc2">
        <link:definition>2410402 - Disclosure - Investments (Schedule of Investments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsTables" roleURI="http://corporate.comcast.com/role/InvestmentsTables">
        <link:definition>2310301 - Disclosure - Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebt" roleURI="http://corporate.comcast.com/role/LongTermDebt">
        <link:definition>2107100 - Disclosure - Long-Term Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtDebtMaturitiesDetails" roleURI="http://corporate.comcast.com/role/LongTermDebtDebtMaturitiesDetails">
        <link:definition>2407403 - Disclosure - Long-Term Debt (Debt Maturities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtNarrativeDetails" roleURI="http://corporate.comcast.com/role/LongTermDebtNarrativeDetails">
        <link:definition>2407404 - Disclosure - Long-Term Debt (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtScheduleOfDebtOutstandingDetails" roleURI="http://corporate.comcast.com/role/LongTermDebtScheduleOfDebtOutstandingDetails">
        <link:definition>2407402 - Disclosure - Long-Term Debt (Schedule of Debt Outstanding) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtScheduleOfDebtOutstandingDetailsCalc2" roleURI="http://corporate.comcast.com/role/LongTermDebtScheduleOfDebtOutstandingDetailsCalc2">
        <link:definition>2407402 - Disclosure - Long-Term Debt (Schedule of Debt Outstanding) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtTables" roleURI="http://corporate.comcast.com/role/LongTermDebtTables">
        <link:definition>2307301 - Disclosure - Long-Term Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ProgrammingAndProductionCosts" roleURI="http://corporate.comcast.com/role/ProgrammingAndProductionCosts">
        <link:definition>2104100 - Disclosure - Programming and Production Costs</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ProgrammingAndProductionCostsNarrativeDetails" roleURI="http://corporate.comcast.com/role/ProgrammingAndProductionCostsNarrativeDetails">
        <link:definition>2404403 - Disclosure - Programming and Production Costs (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ProgrammingAndProductionCostsScheduleDetails" roleURI="http://corporate.comcast.com/role/ProgrammingAndProductionCostsScheduleDetails">
        <link:definition>2404402 - Disclosure - Programming and Production Costs (Schedule) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ProgrammingAndProductionCostsScheduleDetailsCalc2" roleURI="http://corporate.comcast.com/role/ProgrammingAndProductionCostsScheduleDetailsCalc2">
        <link:definition>2404402 - Disclosure - Programming and Production Costs (Schedule) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ProgrammingAndProductionCostsTables" roleURI="http://corporate.comcast.com/role/ProgrammingAndProductionCostsTables">
        <link:definition>2304301 - Disclosure - Programming and Production Costs (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipment" roleURI="http://corporate.comcast.com/role/PropertyAndEquipment">
        <link:definition>2111100 - Disclosure - Property and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipmentDetails" roleURI="http://corporate.comcast.com/role/PropertyAndEquipmentDetails">
        <link:definition>2411402 - Disclosure - Property and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipmentTables" roleURI="http://corporate.comcast.com/role/PropertyAndEquipmentTables">
        <link:definition>2311301 - Disclosure - Property and Equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialInformationUnaudited" roleURI="http://corporate.comcast.com/role/QuarterlyFinancialInformationUnaudited">
        <link:definition>2118100 - Disclosure - Quarterly Financial Information (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialInformationUnauditedDetails" roleURI="http://corporate.comcast.com/role/QuarterlyFinancialInformationUnauditedDetails">
        <link:definition>2418402 - Disclosure - Quarterly Financial Information (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialInformationUnauditedTables" roleURI="http://corporate.comcast.com/role/QuarterlyFinancialInformationUnauditedTables">
        <link:definition>2318301 - Disclosure - Quarterly Financial Information (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncements" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncements">
        <link:definition>2109100 - Disclosure - Recent Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncementsEffectOfChangesInRevenueRecognitionCableCommunicationsSegmentDetails" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncementsEffectOfChangesInRevenueRecognitionCableCommunicationsSegmentDetails">
        <link:definition>2409405 - Disclosure - Recent Accounting Pronouncements (Effect of Changes in Revenue Recognition - Cable Communications Segment) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncementsEffectOfChangesInRevenueRecognitionStatementOfIncomeDetails" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncementsEffectOfChangesInRevenueRecognitionStatementOfIncomeDetails">
        <link:definition>2409403 - Disclosure - Recent Accounting Pronouncements (Effect of Changes in Revenue Recognition - Statement of Income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncementsEffectsOfChangesInRevenueRecognitionBalanceSheetDetails" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncementsEffectsOfChangesInRevenueRecognitionBalanceSheetDetails">
        <link:definition>2409404 - Disclosure - Recent Accounting Pronouncements (Effects of Changes in Revenue Recognition - Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncementsNarrativeDetails" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncementsNarrativeDetails">
        <link:definition>2409406 - Disclosure - Recent Accounting Pronouncements (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncementsPolicies" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncementsPolicies">
        <link:definition>2209201 - Disclosure - Recent Accounting Pronouncements (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingPronouncementsTables" roleURI="http://corporate.comcast.com/role/RecentAccountingPronouncementsTables">
        <link:definition>2309302 - Disclosure - Recent Accounting Pronouncements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactions" roleURI="http://corporate.comcast.com/role/RelatedPartyTransactions">
        <link:definition>2124100 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsCondensedConsolidatedBalanceSheetDetails" roleURI="http://corporate.comcast.com/role/RelatedPartyTransactionsCondensedConsolidatedBalanceSheetDetails">
        <link:definition>2424403 - Disclosure - Related Party Transactions (Condensed Consolidated Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsCondensedConsolidatedStatementOfIncomeDetails" roleURI="http://corporate.comcast.com/role/RelatedPartyTransactionsCondensedConsolidatedStatementOfIncomeDetails">
        <link:definition>2424404 - Disclosure - Related Party Transactions (Condensed Consolidated Statement of Income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsNarrativeDetails" roleURI="http://corporate.comcast.com/role/RelatedPartyTransactionsNarrativeDetails">
        <link:definition>2424402 - Disclosure - Related Party Transactions (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsTables" roleURI="http://corporate.comcast.com/role/RelatedPartyTransactionsTables">
        <link:definition>2324301 - Disclosure - Related Party Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Revenue" roleURI="http://corporate.comcast.com/role/Revenue">
        <link:definition>2103100 - Disclosure - Revenue</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueCondensedConsolidatedBalanceSheetDetails" roleURI="http://corporate.comcast.com/role/RevenueCondensedConsolidatedBalanceSheetDetails">
        <link:definition>2403405 - Disclosure - Revenue (Condensed Consolidated Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueDetails" roleURI="http://corporate.comcast.com/role/RevenueDetails">
        <link:definition>2403402 - Disclosure - Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueNarrativeDetails" roleURI="http://corporate.comcast.com/role/RevenueNarrativeDetails">
        <link:definition>2403404 - Disclosure - Revenue (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRevenueByGeographicLocationDetails" roleURI="http://corporate.comcast.com/role/RevenueRevenueByGeographicLocationDetails">
        <link:definition>2403403 - Disclosure - Revenue (Revenue by Geographic Location) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueTables" roleURI="http://corporate.comcast.com/role/RevenueTables">
        <link:definition>2303301 - Disclosure - Revenue (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiValuationAndQualifyingAccounts" roleURI="http://corporate.comcast.com/role/ScheduleIiValuationAndQualifyingAccounts">
        <link:definition>2125100 - Disclosure - Schedule II Valuation and Qualifying Accounts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiValuationAndQualifyingAccountsDetails" roleURI="http://corporate.comcast.com/role/ScheduleIiValuationAndQualifyingAccountsDetails">
        <link:definition>2425401 - Disclosure - Schedule II Valuation and Qualifying Accounts (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformation" roleURI="http://corporate.comcast.com/role/SegmentInformation">
        <link:definition>2102100 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationDetails" roleURI="http://corporate.comcast.com/role/SegmentInformationDetails">
        <link:definition>2402403 - Disclosure - Segment Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationNarrativeDetails" roleURI="http://corporate.comcast.com/role/SegmentInformationNarrativeDetails">
        <link:definition>2402402 - Disclosure - Segment Information (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationReconciliationOfAdjustedEbitdaFromSegmentToConsolidatedStatementsDetails" roleURI="http://corporate.comcast.com/role/SegmentInformationReconciliationOfAdjustedEbitdaFromSegmentToConsolidatedStatementsDetails">
        <link:definition>2402404 - Disclosure - Segment Information (Reconciliation of Adjusted EBITDA from Segment to Consolidated Statements) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationTables" roleURI="http://corporate.comcast.com/role/SegmentInformationTables">
        <link:definition>2302301 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensation" roleURI="http://corporate.comcast.com/role/ShareBasedCompensation">
        <link:definition>2115100 - Disclosure - Share-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationNarrativeDetails" roleURI="http://corporate.comcast.com/role/ShareBasedCompensationNarrativeDetails">
        <link:definition>2415403 - Disclosure - Share-Based Compensation (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails" roleURI="http://corporate.comcast.com/role/ShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails">
        <link:definition>2415402 - Disclosure - Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails" roleURI="http://corporate.comcast.com/role/ShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails">
        <link:definition>2415405 - Disclosure - Share-Based Compensation (Restricted Share Units and Stock Option Fair Value) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails" roleURI="http://corporate.comcast.com/role/ShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails">
        <link:definition>2415404 - Disclosure - Share-Based Compensation (Stock Options and Restricted Share Units) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationStockOptionsAndRestrictedStockUnitsTables" roleURI="http://corporate.comcast.com/role/ShareBasedCompensationStockOptionsAndRestrictedStockUnitsTables">
        <link:definition>2315301 - Disclosure - Share-Based Compensation, Stock Options and Restricted Stock Units (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactions" roleURI="http://corporate.comcast.com/role/SignificantTransactions">
        <link:definition>2108100 - Disclosure - Significant Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsAcquisitionRelatedCostsDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsAcquisitionRelatedCostsDetails">
        <link:definition>2408404 - Disclosure - Significant Transactions (Acquisition-Related Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsAllocationOfPurchasePriceDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsAllocationOfPurchasePriceDetails">
        <link:definition>2408403 - Disclosure - Significant Transactions (Allocation of Purchase Price) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsDreamworksAnimationDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsDreamworksAnimationDetails">
        <link:definition>2408409 - Disclosure - Significant Transactions (DreamWorks Animation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsFccSpectrumAuctionDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsFccSpectrumAuctionDetails">
        <link:definition>2408407 - Disclosure - Significant Transactions (FCC Spectrum Auction) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsSkyTransactionDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsSkyTransactionDetails">
        <link:definition>2408402 - Disclosure - Significant Transactions (Sky Transaction) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsTables" roleURI="http://corporate.comcast.com/role/SignificantTransactionsTables">
        <link:definition>2308301 - Disclosure - Significant Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsUnauditedActualAndProFormaInformationDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsUnauditedActualAndProFormaInformationDetails">
        <link:definition>2408405 - Disclosure - Significant Transactions (Unaudited Actual and Pro Forma Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsUniversalBeijingResortDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsUniversalBeijingResortDetails">
        <link:definition>2408406 - Disclosure - Significant Transactions (Universal Beijing Resort) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantTransactionsUniversalStudiosJapanDetails" roleURI="http://corporate.comcast.com/role/SignificantTransactionsUniversalStudiosJapanDetails">
        <link:definition>2408408 - Disclosure - Significant Transactions (Universal Studios Japan) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalFinancialInformation" roleURI="http://corporate.comcast.com/role/SupplementalFinancialInformation">
        <link:definition>2116100 - Disclosure - Supplemental Financial Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalFinancialInformationCashCashEquivalentsAndRestrictedCashDetails" roleURI="http://corporate.comcast.com/role/SupplementalFinancialInformationCashCashEquivalentsAndRestrictedCashDetails">
        <link:definition>2416404 - Disclosure - Supplemental Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails" roleURI="http://corporate.comcast.com/role/SupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails">
        <link:definition>2416402 - Disclosure - Supplemental Financial Information (Cash Payments for Interest and Income Taxes) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails" roleURI="http://corporate.comcast.com/role/SupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails">
        <link:definition>2416403 - Disclosure - Supplemental Financial Information (Noncash Investing and Financing Activities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalFinancialInformationSupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" roleURI="http://corporate.comcast.com/role/SupplementalFinancialInformationSupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails">
        <link:definition>2416405 - Disclosure - Supplemental Financial Information Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalFinancialInformationTables" roleURI="http://corporate.comcast.com/role/SupplementalFinancialInformationTables">
        <link:definition>2316301 - Disclosure - Supplemental Financial Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element abstract="true" id="cmcsa_A4.00NotesDue2049ToComcastMember" name="A4.00NotesDue2049ToComcastMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember" name="AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_AccruedParticipationsAndResidualsCurrent" name="AccruedParticipationsAndResidualsCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent" name="AccruedParticipationsResidualsAndProgramObligationsNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_AcquiredFilmandTelevisionLibraryCostsAmortizationPeriod" name="AcquiredFilmandTelevisionLibraryCostsAmortizationPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_AcquisitionRelatedExpenses" name="AcquisitionRelatedExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_AdjustedEBITDA" name="AdjustedEBITDA" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_AirTouchMember" name="AirTouchMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_AmountsReclassifiedToNetIncomeAbstract" name="AmountsReclassifiedToNetIncomeAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_AnnualRevenueThatEstimatesRemainingPerformanceObligations" name="AnnualRevenueThatEstimatesRemainingPerformanceObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_AtairosMember" name="AtairosMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_BroadcastTelevisionMember" name="BroadcastTelevisionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_BusinessAcquisitionPercentageOfVotingInterestsAcquiredInPeriod" name="BusinessAcquisitionPercentageOfVotingInterestsAcquiredInPeriod" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_BusinessAcquisitionProFormaNetIncomeLossAttributableToParent" name="BusinessAcquisitionProFormaNetIncomeLossAttributableToParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_BusinessAndBasisOfPresentationLineItems" name="BusinessAndBasisOfPresentationLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_BusinessAndBasisOfPresentationTable" name="BusinessAndBasisOfPresentationTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAccruedLiabilitiesAndOtherCurrentLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAccruedLiabilitiesAndOtherCurrentLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsReceivableAndOtherCurrentAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsReceivableAndOtherCurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsFilmandTelevisionCosts" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsFilmandTelevisionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsLiabilitiesNet" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsLiabilitiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFilmAndTelevisionCosts" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFilmAndTelevisionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherNoncurrentAssetsAndLiabilitiesNet" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherNoncurrentAssetsAndLiabilitiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_BusinessCustomersMember" name="BusinessCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_BusinessServicesMember" name="BusinessServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CableCommunicationsMember" name="CableCommunicationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CableDistributionSystemMember" name="CableDistributionSystemMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CableNetworksMember" name="CableNetworksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue" name="CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_CapitalContributionAccruedButNotYetPaid" name="CapitalContributionAccruedButNotYetPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_CapitalContributionToVIE" name="CapitalContributionToVIE" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_CarryingAmountOfRedeemablePreferredStock" name="CarryingAmountOfRedeemablePreferredStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_CarryingValueDebtAssumedinAcquisitionNotSubjecttoGuarantee" name="CarryingValueDebtAssumedinAcquisitionNotSubjecttoGuarantee" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_CarryingValueOfContractualObligation" name="CarryingValueOfContractualObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_CarryingValueOfRelatedPartyContractualObligationMember" name="CarryingValueOfRelatedPartyContractualObligationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CashConsiderationTransferredByComcastDomain" name="CashConsiderationTransferredByComcastDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CcclParentMember" name="CcclParentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet" name="ChangeInCurrentAndNoncurrentReceivablesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ChangeInNetDeferredTaxLiabilityRelatedToAcquisitions" name="ChangeInNetDeferredTaxLiabilityRelatedToAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ChangesInNetDeferredTaxLiabilityRelatedToOtherComprehensiveIncome" name="ChangesInNetDeferredTaxLiabilityRelatedToOtherComprehensiveIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastAndComcastCableDebtSecuritiesMember" name="ComcastAndComcastCableDebtSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastAndConsolidatedSubsidiariesMember" name="ComcastAndConsolidatedSubsidiariesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastHoldingsMember" name="ComcastHoldingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastMember" name="ComcastMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastandNBCUniversalRevolvingCreditAgreementsMember" name="ComcastandNBCUniversalRevolvingCreditAgreementsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastandNBCUniversalSeniorNotesMember" name="ComcastandNBCUniversalSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ComcastrevolvingcreditfacilityMember" name="ComcastrevolvingcreditfacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_Commercialpapercapacity" name="Commercialpapercapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_CommitmentAndContingenciesLineItems" name="CommitmentAndContingenciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CommitmentAndContingenciesTable" name="CommitmentAndContingenciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_CommonStockVotingPower" name="CommonStockVotingPower" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ComponentsOfInvestmentandOtherIncomeLossNetTableTextBlock" name="ComponentsOfInvestmentandOtherIncomeLossNetTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTableTextBlock" name="CondensedInformationOnOurPostretirementAndPensionBenefitPlansTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ConsiderationTransferredByComcastAxis" name="ConsiderationTransferredByComcastAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ConsiderationTransferredByComcastMember" name="ConsiderationTransferredByComcastMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ContentLicensingAndOtherMember" name="ContentLicensingAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ContentLicensingMember" name="ContentLicensingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ContentMember" name="ContentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ContractualValueofaPotentialFutureObligation" name="ContractualValueofaPotentialFutureObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests" name="ContributionsFromAndDistributionsToNoncontrollingInterests" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterestsAttributableToTemporaryEquity" name="ContributionsFromAndDistributionsToNoncontrollingInterestsAttributableToTemporaryEquity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_CustomerPremiseEquipmentMember" name="CustomerPremiseEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DebtExchangeAmount" name="DebtExchangeAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DebtInstrumentTermLoanMaximumBorrowingCapacity" name="DebtInstrumentTermLoanMaximumBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_Debtissuancecostspremiumsdiscountsadjustments" name="Debtissuancecostspremiumsdiscountsadjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_DecreaseInDeferredTaxLiabilities2017TaxReformEnactment" name="DecreaseInDeferredTaxLiabilities2017TaxReformEnactment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DecreaseInDeferredTaxLiabilitiesForeignTaxes2017TaxReformenactment" name="DecreaseInDeferredTaxLiabilitiesForeignTaxes2017TaxReformenactment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DeferredCompensationPlansBenefitObligation" name="DeferredCompensationPlansBenefitObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DeferredCompensationPlansInterestCost" name="DeferredCompensationPlansInterestCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DeferredCompensationPlansMember" name="DeferredCompensationPlansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DeferredCompensationPlansTextBlock" name="DeferredCompensationPlansTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DeferredTaxLiabilitiesLongTermDebt" name="DeferredTaxLiabilitiesLongTermDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets" name="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_DeferredTaxLiabilityFranchiseRights" name="DeferredTaxLiabilityFranchiseRights" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_DeferredTaxLiabilityInvestments" name="DeferredTaxLiabilityInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_DeferredTaxRelatedToPurchaseOfNoncontrollingInterest" name="DeferredTaxRelatedToPurchaseOfNoncontrollingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_Deposit" name="Deposit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DepositToAcquireIntangibleAsset" name="DepositToAcquireIntangibleAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DepreciationAndAmortizationAndGainLossOnDispositionOfAssets" name="DepreciationAndAmortizationAndGainLossOnDispositionOfAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DevelopedTechnologyMember" name="DevelopedTechnologyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DirectToConsumerMember" name="DirectToConsumerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DirecttoTelevisionFilmCostsInProductionandInDevelopment" name="DirecttoTelevisionFilmCostsInProductionandInDevelopment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_DistributionAndOtherMember" name="DistributionAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DistributionMember" name="DistributionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock" name="DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_Distributionstononcontrollinginterestholders" name="Distributionstononcontrollinginterestholders" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DocumentAndEntityInformationLineItems" name="DocumentAndEntityInformationLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DocumentAndEntityInformationTable" name="DocumentAndEntityInformationTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_DomesticTaxExpenseBenefit" name="DomesticTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_DreamworksAnimationMember" name="DreamworksAnimationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_EffectiveIncomeTaxRateReconciliation2017taxreformlegislation" name="EffectiveIncomeTaxRateReconciliation2017taxreformlegislation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_EquityLineItems" name="EquityLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_EquityMethodInvestmentDeferredGain" name="EquityMethodInvestmentDeferredGain" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_EquityMethodInvestmentFundingCommitment" name="EquityMethodInvestmentFundingCommitment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_EquityMethodInvestmentFundingCommitmentbyManagementCompanyInvestors" name="EquityMethodInvestmentFundingCommitmentbyManagementCompanyInvestors" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_EquityMethodInvestmentManagementFeeFundingCommitment" name="EquityMethodInvestmentManagementFeeFundingCommitment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_EquityMethodInvestmentPercentofLosses" name="EquityMethodInvestmentPercentofLosses" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_EquityMethodInvestmentPutorCallPeriod" name="EquityMethodInvestmentPutorCallPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_EquityProfitLoss" name="EquityProfitLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_EquityTable" name="EquityTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_FCCSpectrumAuctionLineItems" name="FCCSpectrumAuctionLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_FairValueOfRedeemablePreferredShares" name="FairValueOfRedeemablePreferredShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_FilmAndTelevisionCostLineItems" name="FilmAndTelevisionCostLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_FilmAndTelevisionCostTable" name="FilmAndTelevisionCostTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_FilmAndTelevisionCosts" name="FilmAndTelevisionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_FilmAndTelevisionCostsDisclosureTextBlock" name="FilmAndTelevisionCostsDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_FilmAndTelevisionCostsPolicyTextBlock" name="FilmAndTelevisionCostsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_FilmAndTelevisionLibraryCostsUnamortized" name="FilmAndTelevisionLibraryCostsUnamortized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_FilmedEntertainmentMember" name="FilmedEntertainmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ForeignWithholdingTaxExpense" name="ForeignWithholdingTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_FormerCFOMember" name="FormerCFOMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_FormerComcastAndNBCUniversalRevolvingCreditAgreementsMember" name="FormerComcastAndNBCUniversalRevolvingCreditAgreementsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_FranchiseAndOtherRegulatoryFeesMember" name="FranchiseAndOtherRegulatoryFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_GainLossOnInvestmentsAndOtherNoncashIncomeLossNet" name="GainLossOnInvestmentsAndOtherNoncashIncomeLossNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_GoodwillAndIntangibleAssetsLineItems" name="GoodwillAndIntangibleAssetsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_GoodwillAndIntangibleAssetsTable" name="GoodwillAndIntangibleAssetsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_GuaranteeObligationsCurrentPrincipalBalance" name="GuaranteeObligationsCurrentPrincipalBalance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_GuaranteeObligationsMaximumCapacityOfCreditFacility" name="GuaranteeObligationsMaximumCapacityOfCreditFacility" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_GuaranteeObligationsTermLoans" name="GuaranteeObligationsTermLoans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_HighSpeedInternetCustomersMember" name="HighSpeedInternetCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_HomeEntertainmentMember" name="HomeEntertainmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_HuluMember" name="HuluMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_IncomeTaxBenefit2018TaxReformLegislation" name="IncomeTaxBenefit2018TaxReformLegislation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_IncomeTaxesLineItems" name="IncomeTaxesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_IncomeTaxesTable" name="IncomeTaxesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_Incometaxtransitiontax2017taxreformlegislation" name="Incometaxtransitiontax2017taxreformlegislation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_Increasedecreaseinfilmandtelevisioncostnet" name="Increasedecreaseinfilmandtelevisioncostnet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_InterestExpenses" name="InterestExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_InvestmentsImpairmentPolicyTextBlock" name="InvestmentsImpairmentPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation" name="InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_InvestmentsLineItems" name="InvestmentsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_InvestmentsTable" name="InvestmentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_LettersOfCreditAndBankGuaranteesOutstandingAmount" name="LettersOfCreditAndBankGuaranteesOutstandingAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_LineofCreditfacilityPotentialincreasetoMaximumBorrowingCapacity" name="LineofCreditfacilityPotentialincreasetoMaximumBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_ManagementFeeMember" name="ManagementFeeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_MaturingInNextFiveYearsMember" name="MaturingInNextFiveYearsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_MemberContribution" name="MemberContribution" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_MembersCapitalMember" name="MembersCapitalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NBCUniversalHoldingsPreferredStockMember" name="NBCUniversalHoldingsPreferredStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NBCUniversalMediaLLCMember" name="NBCUniversalMediaLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NBCUniversalSegmentsMember" name="NBCUniversalSegmentsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NbcuniversalEnterpriseCommercialPaperMember" name="NbcuniversalEnterpriseCommercialPaperMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NbcuniversalEnterpriseCreditFacilityMember" name="NbcuniversalEnterpriseCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NbcuniversalEnterpriseMember" name="NbcuniversalEnterpriseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NbcuniversalMediaParentMember" name="NbcuniversalMediaParentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" name="NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NetTransactionsWithAffiliates" name="NetTransactionsWithAffiliates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_NewAuthorizationMember" name="NewAuthorizationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NonGuaranteeObligationsCurrentPrincipalBalance" name="NonGuaranteeObligationsCurrentPrincipalBalance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_NoncashInterestExpenseIncomeNet" name="NoncashInterestExpenseIncomeNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NonredeemablePreferredStock" name="NonredeemablePreferredStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_NotePayableToUltimateParent" name="NotePayableToUltimateParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_NoteReceivableFromUltimateParent" name="NoteReceivableFromUltimateParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_NoteReceivableIssuedFromUltimateParent" name="NoteReceivableIssuedFromUltimateParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_Notes550Due2029Member" name="Notes550Due2029Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NumberOfBusinesses" name="NumberOfBusinesses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NumberOfCustomers" name="NumberOfCustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements" name="NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock" name="NumberOfVotesEntitledOfEachClassBCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:positiveIntegerItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NumberofDivisions" name="NumberofDivisions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_NumberofPreferredStockSeries" name="NumberofPreferredStockSeries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_OperatingExpensesExcludingDepreciationAndAmortization" name="OperatingExpensesExcludingDepreciationAndAmortization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_OtherIncludingCapitalLeaseObligationsMember" name="OtherIncludingCapitalLeaseObligationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_OtherIncomeExpenseRelatedParty" name="OtherIncomeExpenseRelatedParty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_OtherIncomeLossNet" name="OtherIncomeLossNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_OtherMember" name="OtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_OtherOperatingAndAdministrative" name="OtherOperatingAndAdministrative" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_OtherStockholdersEquity" name="OtherStockholdersEquity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_OwnershipInCableHoldingCompanySubsidiaries" name="OwnershipInCableHoldingCompanySubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_PatentsAndOtherTechnologyRightsMember" name="PatentsAndOtherTechnologyRightsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties" name="PaymentsForAcquisitionsAndConstructionOfRealEstateProperties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PaymentsForConstructionOfThemePark" name="PaymentsForConstructionOfThemePark" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears" name="PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_Percentageofresidualreturns" name="Percentageofresidualreturns" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_PreferredStockAggregateRedemptionValue" name="PreferredStockAggregateRedemptionValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PreferredStockCallPeriod" name="PreferredStockCallPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PreferredStockDividendRateSpreadOnVariableRate" name="PreferredStockDividendRateSpreadOnVariableRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PreferredStockPutPeriod" name="PreferredStockPutPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_PretaxGainOnSaleOfInvestment" name="PretaxGainOnSaleOfInvestment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromUltimateParent" name="ProceedsFromNoteReceivableIssuedToAndBorrowingsFromUltimateParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ProceedsFromSalesOfBusinessesAndInvestments" name="ProceedsFromSalesOfBusinessesAndInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ProgrammingAndProductionCosts" name="ProgrammingAndProductionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ProgrammingRightsCurrent" name="ProgrammingRightsCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_ProgrammingRightsLessAmortization" name="ProgrammingRightsLessAmortization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_RecentAccountingPronouncementsLineItems" name="RecentAccountingPronouncementsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_RecentAccountingPronouncementsTable" name="RecentAccountingPronouncementsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_RedeemableNoncontrollingInterestMember" name="RedeemableNoncontrollingInterestMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStockMember" name="RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee" name="RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee" name="RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_RentalExpenseTableTextBlock" name="RentalExpenseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ResidentialCustomersMember" name="ResidentialCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ResidentialHighSpeedInternetMember" name="ResidentialHighSpeedInternetMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ResidentialMember" name="ResidentialMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ResidentialVideoMember" name="ResidentialVideoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ResidentialVoiceMember" name="ResidentialVoiceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_RevenuePerformanceObligationDescriptionOfPaymentTermsPeriod" name="RevenuePerformanceObligationDescriptionOfPaymentTermsPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_RevenuePerformanceObligationDescriptionOfTimingTermOfContract" name="RevenuePerformanceObligationDescriptionOfTimingTermOfContract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_RevolvingBankCreditFacilityMember" name="RevolvingBankCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_RevolvingCreditAgreementCapacity" name="RevolvingCreditAgreementCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_ScheduleOfCashCashEquivalentsAndRestrictedCashTableTextBlock" name="ScheduleOfCashCashEquivalentsAndRestrictedCashTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock" name="ScheduleOfFilmAndTelevisionCostsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ScheduleOfIntangibleAssetsTable" name="ScheduleOfIntangibleAssetsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_ScheduleOfOtherBalanceSheetAccountsTableTextBlock" name="ScheduleOfOtherBalanceSheetAccountsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ScheduleofFairValueMethodInvestmentsLineItems" name="ScheduleofFairValueMethodInvestmentsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ScheduleofFairValueMethodInvestmentsTable" name="ScheduleofFairValueMethodInvestmentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ScheduleofIndefiniteandFiniteLivedIntangibleAssetsLineItems" name="ScheduleofIndefiniteandFiniteLivedIntangibleAssetsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ScheduleofIndefiniteandFiniteLivedIntangibleAssetsTable" name="ScheduleofIndefiniteandFiniteLivedIntangibleAssetsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SecurityAndAutomationCustomersMember" name="SecurityAndAutomationCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_Senior3.97NotesDue2047Member" name="Senior3.97NotesDue2047Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_Senior4.00NotesDue2049Member" name="Senior4.00NotesDue2049Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_Senior4.05NotesDue2052Member" name="Senior4.05NotesDue2052Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_Senior6.40NotesDue2040Member" name="Senior6.40NotesDue2040Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorNotesExchangeMember" name="SeniorNotesExchangeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorNotesFixedAndFloatingRatesWithMaturitiesBetween2020and2058Member" name="SeniorNotesFixedAndFloatingRatesWithMaturitiesBetween2020and2058Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorNotesWithMaturitiesBetween5And10YearsatfacevalueMember" name="SeniorNotesWithMaturitiesBetween5And10YearsatfacevalueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsatfacevalueMember" name="SeniorNotesWithMaturitiesGreaterThan10YearsatfacevalueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessatFaceValueMember" name="SeniorNotesWithMaturitiesOf5YearsOrLessatFaceValueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorUnsecuredFixedAndFloatingRateNotesIssuedOctober2018Member" name="SeniorUnsecuredFixedAndFloatingRateNotesIssuedOctober2018Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SeniorUnsecuredFixedRateNotesIssuedFebruary2018Member" name="SeniorUnsecuredFixedRateNotesIssuedFebruary2018Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_SignificantTransactionsTextBlock" name="SignificantTransactionsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyLimitedMember" name="SkyLimitedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyOutstandingIndebtednessEuroDenominatedMember" name="SkyOutstandingIndebtednessEuroDenominatedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyOutstandingIndebtednessMember" name="SkyOutstandingIndebtednessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyOutstandingIndebtednessPoundsSterlingDenominatedMember" name="SkyOutstandingIndebtednessPoundsSterlingDenominatedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyOutstandingIndebtednessU.S.DollarDenominatedMember" name="SkyOutstandingIndebtednessU.S.DollarDenominatedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyRevolvingCreditFacilityMember" name="SkyRevolvingCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SkyTransactionTermLoanMember" name="SkyTransactionTermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SnapMember" name="SnapMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock" name="StockOptionFairValueAndSignificantAssumptionsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SupplementalFinancialInformationAbstract" name="SupplementalFinancialInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SupplementalFinancialInformationLineItems" name="SupplementalFinancialInformationLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_SupplementalFinancialInformationTable" name="SupplementalFinancialInformationTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_TaxAdjustmentsAxis" name="TaxAdjustmentsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_TaxAdjustmentsDomain" name="TaxAdjustmentsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_TemporaryEquityFairValueOfRedeemableSubsidiaryPreferredStock" name="TemporaryEquityFairValueOfRedeemableSubsidiaryPreferredStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_TermLoansMember" name="TermLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_TermOfAgreement" name="TermOfAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_TheatricalFilmCostsInProductionAndInDevelopment" name="TheatricalFilmCostsInProductionAndInDevelopment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_TheatricalMember" name="TheatricalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_ThemeParksMember" name="ThemeParksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_TimeWarnerInc.Member" name="TimeWarnerInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_TotalCustomerRelationships" name="TotalCustomerRelationships" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization" name="TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cmcsa_TotalRetailCustomerRelationships" name="TotalRetailCustomerRelationships" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember" name="UncertainAndEffectivelySettledTaxPositionsNetMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UncertainTaxPositionsIndemnifiedByThirdPartyMember" name="UncertainTaxPositionsIndemnifiedByThirdPartyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UniversalBeijingResortMember" name="UniversalBeijingResortMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UniversalBeijingResortTermLoansMember" name="UniversalBeijingResortTermLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UniversalStudiosJapanMember" name="UniversalStudiosJapanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UniversalStudiosJapanTermLoanMaturingMarch2022Member" name="UniversalStudiosJapanTermLoanMaturingMarch2022Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UniversalStudiosJapanTermLoansMaturing2022Member" name="UniversalStudiosJapanTermLoansMaturing2022Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries" name="UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_UnrecognizedTaxBenefitsPositionsPaid" name="UnrecognizedTaxBenefitsPositionsPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UnsecuredDollarDenominatedTermLoanCreditAgreementMember" name="UnsecuredDollarDenominatedTermLoanCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_UnsecuredSterlingDenominatedTermLoanCreditAgreementMember" name="UnsecuredSterlingDenominatedTermLoanCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cmcsa_VariableInterestEntityMaximumBorrowingCapacity" name="VariableInterestEntityMaximumBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cmcsa_VideoCustomersMember" name="VideoCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_VoiceCustomersMember" name="VoiceCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cmcsa_WeatherChannelMember" name="WeatherChannelMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
