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        <link:definition>42102 - Disclosure - Subsequent Events (Acquisition-Related Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.comcast.com/taxonomy/role/DisclosureCondensedConsolidatingFinancialInformationNarrativeDetails" id="DisclosureCondensedConsolidatingFinancialInformationNarrativeDetails">
        <link:definition>42201 - Disclosure - Condensed Consolidating Financial Information (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
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  <element id="cmcsa_CableSegmentRevenuePercentageHighSpeedInternetMember" name="CableSegmentRevenuePercentageHighSpeedInternetMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CableSegmentRevenuePercentagePhoneMember" name="CableSegmentRevenuePercentagePhoneMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CableSegmentRevenuePercentageAdvertisingMember" name="CableSegmentRevenuePercentageAdvertisingMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CableSegmentRevenuePercentageFranchiseFeesMember" name="CableSegmentRevenuePercentageFranchiseFeesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="cmcsa_PrincipalAmountIssuedOf64NotesDue2040Member" name="PrincipalAmountIssuedOf64NotesDue2040Member" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="cmcsa_ComcastAssetPoolMember" name="ComcastAssetPoolMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_InsightAssetPoolMember" name="InsightAssetPoolMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_InsightTransactionMember" name="InsightTransactionMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NbcUniversalMember" name="NbcUniversalMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CustomerPremisesEquipmentMember" name="CustomerPremisesEquipmentMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember" name="CableFranchiseRenewalCostsAndContractualOperatingRightsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PatentsAndOtherTechnologyRightsMember" name="PatentsAndOtherTechnologyRightsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ProgrammingAgreementsAndRightsMember" name="ProgrammingAgreementsAndRightsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OtherAgreementsAndRightsMember" name="OtherAgreementsAndRightsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_AmortizationOfCertainIntangibleAssetsTextBlock" name="AmortizationOfCertainIntangibleAssetsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PercentageOfAssetsAndLiabilitiesAgreedToBeDivided" name="PercentageOfAssetsAndLiabilitiesAgreedToBeDivided" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NumberOfCustomersReceivedFromCableSystems" name="NumberOfCustomersReceivedFromCableSystems" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PercentageOfInterestExchangedInBusinessAcquisition" name="PercentageOfInterestExchangedInBusinessAcquisition" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_FairValueMethodMember" name="FairValueMethodMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ProgrammingLicenseExpense" name="ProgrammingLicenseExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_RegionalSportsNetworksMember" name="RegionalSportsNetworksMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_TechnologyVenturesMember" name="TechnologyVenturesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DeferredCompensationPlansMember" name="DeferredCompensationPlansMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DeferredCompensationPlansBenefitObligation" name="DeferredCompensationPlansBenefitObligation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_DeferredCompensationPlansInterestCost" name="DeferredCompensationPlansInterestCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_RetirementInvestmentPlansMember" name="RetirementInvestmentPlansMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CommonStockVotingPower" name="CommonStockVotingPower" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_StockRepurchaseProgramAvailabilityOfSharesAuthorized" name="StockRepurchaseProgramAvailabilityOfSharesAuthorized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_IncomeTaxesAbstract" name="IncomeTaxesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cmcsa_DeferredCompensationPlansTextBlock" name="DeferredCompensationPlansTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="cmcsa_ChangesInCommonStockTextBlock" name="ChangesInCommonStockTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_RecognizedShareBasedCompensationExpenseTextBlock" name="RecognizedShareBasedCompensationExpenseTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock" name="StockOptionFairValueAndSignificantAssumptionsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_StockOptionActivityTextBlock" name="StockOptionActivityTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ExercisedStockOptionsTextBlock" name="ExercisedStockOptionsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock" name="WeightedAverageFairValueOfRestrictedStockUnitsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_RestrictedStockPlanActivityTextBlock" name="RestrictedStockPlanActivityTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_VestedRestrictedShareUnitsTextBlock" name="VestedRestrictedShareUnitsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ComponentsOfIncomeTaxExpenseTextBlock" name="ComponentsOfIncomeTaxExpenseTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ComponentsOfNetDeferredTaxLiabilityTextBlock" name="ComponentsOfNetDeferredTaxLiabilityTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ReconciliationOfUnrecognizedTaxBenefitsTextBlock" name="ReconciliationOfUnrecognizedTaxBenefitsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ComponentsOfQuarterlyFinancialInformationTextBlock" name="ComponentsOfQuarterlyFinancialInformationTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_VideoCustomersMember" name="VideoCustomersMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_HighSpeedInternetCustomersMember" name="HighSpeedInternetCustomersMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PhoneCustomersMember" name="PhoneCustomersMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NumberOfCustomers" name="NumberOfCustomers" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OptionPlansMember" name="OptionPlansMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CashSettledOptionsMember" name="CashSettledOptionsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NetSettledOptionsMember" name="NetSettledOptionsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ExercisedStockOptionsMember" name="ExercisedStockOptionsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DeferredStockOptionPlanMember" name="DeferredStockOptionPlanMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_RestrictedStockPlanMember" name="RestrictedStockPlanMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting" name="NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_TaxBenefitOfRsusVested" name="TaxBenefitOfRsusVested" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_NonvestedRestrictedShareUnitAwardsMember" name="NonvestedRestrictedShareUnitAwardsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_VestedRestrictedShareUnitsMember" name="VestedRestrictedShareUnitsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ClearwireLlcMember" name="ClearwireLlcMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OtherEquityMethodInvestmentsMember" name="OtherEquityMethodInvestmentsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OtherCostMethodInvestmentMember" name="OtherCostMethodInvestmentMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_InitialInvestmentInEquityMethodInvestment" name="InitialInvestmentInEquityMethodInvestment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_ClearwireClassBStockMember" name="ClearwireClassBStockMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ClearwireCorporationMember" name="ClearwireCorporationMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PreferredStockAggregateRedemptionValue" name="PreferredStockAggregateRedemptionValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_DefinedBenefitPlanExpectedReturnOnPlanAssetsRate" name="DefinedBenefitPlanExpectedReturnOnPlanAssetsRate" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NondeductibleAccrualsAndOther" name="NondeductibleAccrualsAndOther" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cmcsa_ErisaLitigationMember" name="ErisaLitigationMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ComcastSpectacorMember" name="ComcastSpectacorMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ProgrammingLicenseAgreementsFutureMinimumPaymentsCurrent" name="ProgrammingLicenseAgreementsFutureMinimumPaymentsCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_ProgrammingLicenseAgreementsFutureMinimumPaymentsInTwoYears" name="ProgrammingLicenseAgreementsFutureMinimumPaymentsInTwoYears" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_ProgrammingLicenseAgreementsFutureMinimumPaymentsInThreeYears" name="ProgrammingLicenseAgreementsFutureMinimumPaymentsInThreeYears" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_ProgrammingLicenseAgreementsFutureMinimumPaymentsInFourYears" name="ProgrammingLicenseAgreementsFutureMinimumPaymentsInFourYears" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_ProgrammingLicenseAgreementsFutureMinimumPaymentsInFiveYears" name="ProgrammingLicenseAgreementsFutureMinimumPaymentsInFiveYears" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_ProgrammingLicenseAgreementsFutureMinimumPaymentsDueThereafter" name="ProgrammingLicenseAgreementsFutureMinimumPaymentsDueThereafter" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_OwnershipPercentageInNewCompany" name="OwnershipPercentageInNewCompany" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NoncontrollingInvestorsOwnershipPercentageInNewCompany" name="NoncontrollingInvestorsOwnershipPercentageInNewCompany" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_UseOfEstimatesPolicyTextBlock" name="UseOfEstimatesPolicyTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CableProgrammingExpensesPolicyTextBlock" name="CableProgrammingExpensesPolicyTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ScheduleOfItemsThatEffectIncomeTaxExpenseTextBlock" name="ScheduleOfItemsThatEffectIncomeTaxExpenseTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_SpectrumCoLlcMember" name="SpectrumCoLlcMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OrganizationAndBusinessAbstract" name="OrganizationAndBusinessAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cmcsa_FairValueOfCostMethodInvestment" name="FairValueOfCostMethodInvestment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_CustomerPremisesEquipment" name="CustomerPremisesEquipment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cmcsa_WeightedAverageOriginalUsefulLife" name="WeightedAverageOriginalUsefulLife" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cmcsa_FutureExpenseYearOne" name="FutureExpenseYearOne" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_FutureExpenseYearTwo" name="FutureExpenseYearTwo" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_FutureExpenseYearThree" name="FutureExpenseYearThree" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_FutureExpenseYearFour" name="FutureExpenseYearFour" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_FutureExpenseYearFive" name="FutureExpenseYearFive" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_DebtWeightedAverageInterestRate" name="DebtWeightedAverageInterestRate" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cmcsa_TotalDebtFairValueDisclosure" name="TotalDebtFairValueDisclosure" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cmcsa_RevolvingBankCreditFacility" name="RevolvingBankCreditFacility" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cmcsa_BaseRateMember" name="BaseRateMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NumberOfSharesToBeUsedToCalculateMarketValueIfDebtWasConverted" name="NumberOfSharesToBeUsedToCalculateMarketValueIfDebtWasConverted" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ExchangeRatioAtHolderSOptionForAmountOfCashEqualToAggregateMarketValueOfCertainShares" name="ExchangeRatioAtHolderSOptionForAmountOfCashEqualToAggregateMarketValueOfCertainShares" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_MultiplierUsedToCalculateMarketValueOfCertainShares" name="MultiplierUsedToCalculateMarketValueOfCertainShares" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PrepaidForwardSaleAgreementsSecuritiesMember" name="PrepaidForwardSaleAgreementsSecuritiesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_PrepaidForwardSaleAgreementDerivativeMember" name="PrepaidForwardSaleAgreementDerivativeMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NondesignatedPrepaidForwardSaleAgreementsMember" name="NondesignatedPrepaidForwardSaleAgreementsMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ZonesMember" name="ZonesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_InterestRateSwapAveragePayRate" name="InterestRateSwapAveragePayRate" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cmcsa_InterestRateSwapAverageReceiveRate" name="InterestRateSwapAverageReceiveRate" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cmcsa_AccruedSwapInterest" name="AccruedSwapInterest" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cmcsa_DecreaseInAdditionalPaidInCapitalResultingFromPurchaseOfNoncontrollingInterest" name="DecreaseInAdditionalPaidInCapitalResultingFromPurchaseOfNoncontrollingInterest" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock" name="CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ScheduleOfDividendsTextBlock" name="ScheduleOfDividendsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock" name="NumberOfVotesEntitledOfEachClassBCommonStock" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_StockrepurchaseprogramAdditionalShareAuthorization" name="StockrepurchaseprogramAdditionalShareAuthorization" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_DeferredGainsLossesOnCashFlowHedges" name="DeferredGainsLossesOnCashFlowHedges" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cmcsa_RentalExpenseAndProgrammingLicenseExpenseTextBlock" name="RentalExpenseAndProgrammingLicenseExpenseTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NonCashExchangeOfInterest" name="NonCashExchangeOfInterest" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cmcsa_InsightMember" name="InsightMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_InterestIssued" name="InterestIssued" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cmcsa_TaxAdjustmentsAxis" name="TaxAdjustmentsAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" />
  <element id="cmcsa_TaxAdjustmentsDomain" name="TaxAdjustmentsDomain" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OtherLongTermLiabilitiesMember" name="OtherLongTermLiabilitiesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_GoodwillMember" name="GoodwillMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations" name="IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_IncomeTaxRateReconciliationAccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNet" name="IncomeTaxRateReconciliationAccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
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  <element id="cmcsa_NonCashInterestExpense" name="NonCashInterestExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_OwnershipUnitsInvestment" name="OwnershipUnitsInvestment" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ClearwireCorporationClassStockMember" name="ClearwireCorporationClassStockMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_SubsequentEventsAbstract" name="SubsequentEventsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cmcsa_GeMember" name="GeMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DebtMaturityPeriodMinimum" name="DebtMaturityPeriodMinimum" nillable="true" type="us-types:dateStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DebtMaturityPeriodMaximum" name="DebtMaturityPeriodMaximum" nillable="true" type="us-types:dateStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ScheduleOfAcquisitionRelatedExpensesTextBlock" name="ScheduleOfAcquisitionRelatedExpensesTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_BusinessAcquisitionRelatedExpensesMember" name="BusinessAcquisitionRelatedExpensesMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_ScheduleOfOtherComprehensiveIncomeUnrealizedGainLossOnDerivativeTableTextBlock" name="ScheduleOfOtherComprehensiveIncomeUnrealizedGainLossOnDerivativeTableTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet" name="GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_PrincipalAmountIssuedOf550NotesDue2029Member" name="PrincipalAmountIssuedOf550NotesDue2029Member" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_Notes550Due2029Member" name="Notes550Due2029Member" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_SprintNextelCommonStockMember" name="SprintNextelCommonStockMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CenturylinkCommonStockMember" name="CenturylinkCommonStockMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_FairValueOfAssetPoolReceivedInBusinessTransaction" name="FairValueOfAssetPoolReceivedInBusinessTransaction" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_VotingUnitsInEquityMethodInvestment" name="VotingUnitsInEquityMethodInvestment" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CableDistributionSystems" name="CableDistributionSystems" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_CableDistributionSystemMember" name="CableDistributionSystemMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_AmountOfGainLossRecognizedInIncomeFairValueHedgesTextBlock" name="AmountOfGainLossRecognizedInIncomeFairValueHedgesTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_AmountOfGainLossRecognizedInIncomeNondesignatedTextBlock" name="AmountOfGainLossRecognizedInIncomeNondesignatedTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_UnrealizedGainsLossesOnSecuritiesUnderlyingPrepaidForwardSaleAgreements" name="UnrealizedGainsLossesOnSecuritiesUnderlyingPrepaidForwardSaleAgreements" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_InterestRateCollarMember" name="InterestRateCollarMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_GainLossReclassifiedToEarnings" name="GainLossReclassifiedToEarnings" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_TotalChangeInAccumulatedOtherComprehensiveIncome" name="TotalChangeInAccumulatedOtherComprehensiveIncome" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_ForeignExchangeRiskMember" name="ForeignExchangeRiskMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNextTwelveMonthsNetOfDeferredTaxes" name="InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNextTwelveMonthsNetOfDeferredTaxes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_TotalGainLossRecognizedInAccumulatedOtherComprehensiveIncome" name="TotalGainLossRecognizedInAccumulatedOtherComprehensiveIncome" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets" name="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cmcsa_AdditionalInterestRateOnBaseRateOptionChosen" name="AdditionalInterestRateOnBaseRateOptionChosen" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges" name="CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_VehiclesAndOtherEquipmentMember" name="VehiclesAndOtherEquipmentMember" nillable="true" type="us-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_VehiclesAndOtherEquipment" name="VehiclesAndOtherEquipment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock" name="ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_SplitDollarLifeInsuranceAgreementsBenefitObligation" name="SplitDollarLifeInsuranceAgreementsBenefitObligation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_IncreaseToPlannedAnnualDividend" name="IncreaseToPlannedAnnualDividend" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_EquitySecuritiesHeldAsCollateral" name="EquitySecuritiesHeldAsCollateral" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cmcsa_HoldingCompanyOwnershipInSubsidiaries" name="HoldingCompanyOwnershipInSubsidiaries" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DifferencesBetweenBookAndTaxBasisOfLongTermDebt" name="DifferencesBetweenBookAndTaxBasisOfLongTermDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
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  <element id="cmcsa_DebtRepaymentsAndRepurchasesTextBlock" name="DebtRepaymentsAndRepurchasesTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_NumberOfWireLessSpectrumLicenses" name="NumberOfWireLessSpectrumLicenses" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_OtherCurrentAssetsIncludingDeferredIncomeTaxes" name="OtherCurrentAssetsIncludingDeferredIncomeTaxes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingAccruedSalariesAndWages" name="AccruedExpensesAndOtherCurrentLiabilitiesIncludingAccruedSalariesAndWages" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
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  <element id="cmcsa_NumberOfCustomersReceivedByOtherPartnerUponDissolutionOfPartnership" name="NumberOfCustomersReceivedByOtherPartnerUponDissolutionOfPartnership" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="cmcsa_AggregatePurchasePriceOfSeriesOfBusinessAcquisitions" name="AggregatePurchasePriceOfSeriesOfBusinessAcquisitions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cmcsa_GainOnSaleOfFiftyPercentInterestOfAssetPool" name="GainOnSaleOfFiftyPercentInterestOfAssetPool" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_OwnershipInterestInCableSystemPartnership" name="OwnershipInterestInCableSystemPartnership" nillable="true" type="us-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="cmcsa_SummaryInterestRateSwapsTermsTextBlock" name="SummaryInterestRateSwapsTermsTextBlock" nillable="true" type="us-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cmcsa_DerivativeFairValueofEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements" name="DerivativeFairValueofEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
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  <element id="cmcsa_DebtIssuanceOfAcquiredCompanyPriorToCloseOfTransaction" name="DebtIssuanceOfAcquiredCompanyPriorToCloseOfTransaction" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cmcsa_RepaymentOfDebtOfAcquiredCompanyPriorToCloseOfTransaction" name="RepaymentOfDebtOfAcquiredCompanyPriorToCloseOfTransaction" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cmcsa_CashPayableToNoncontrollingInvestorInNewCompany" name="CashPayableToNoncontrollingInvestorInNewCompany" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
</schema>
</XBRL>
