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    <element name="SpectrumCoLlcMember" id="cmcsa_SpectrumCoLlcMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="OrganizationAndBusinessAbstract" id="cmcsa_OrganizationAndBusinessAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="CustomerPremiseEquipment" id="cmcsa_CustomerPremiseEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
    <element name="WeightedAverageOriginalUsefulLife" id="cmcsa_WeightedAverageOriginalUsefulLife" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="CondensedInformationOnOurPensionBenefitPlansTextBlock" id="cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="ScheduleOfDividendsTextBlock" id="cmcsa_ScheduleOfDividendsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="NumberOfVotesEntitledOfEachClassBCommonStock" id="cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="RentalExpenseTableTextBlock" id="cmcsa_RentalExpenseTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="TaxAdjustmentsAxis" id="cmcsa_TaxAdjustmentsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="TaxAdjustmentsDomain" id="cmcsa_TaxAdjustmentsDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations" id="cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="ComcastCorporationMember" id="cmcsa_ComcastCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet" id="cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="Notes550Due2029Member" id="cmcsa_Notes550Due2029Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="CableDistributionSystems" id="cmcsa_CableDistributionSystems" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
    <element name="CableDistributionSystemMember" id="cmcsa_CableDistributionSystemMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges" id="cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock" id="cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="SplitDollarLifeInsuranceAgreementsBenefitObligation" id="cmcsa_SplitDollarLifeInsuranceAgreementsBenefitObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="IncreaseToPlannedAnnualDividend" id="cmcsa_IncreaseToPlannedAnnualDividend" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="EquitySecuritiesHeldAsCollateral" id="cmcsa_EquitySecuritiesHeldAsCollateral" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
    <element name="DebtRepaymentsAndRepurchasesTableTextBlock" id="cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="NumberOfWireLessSpectrumLicenses" id="cmcsa_NumberOfWireLessSpectrumLicenses" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="NonredeemablePreferredStock" id="cmcsa_NonredeemablePreferredStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="InitialInvestmentByInvestorGroup" id="cmcsa_InitialInvestmentByInvestorGroup" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
    <element name="DescriptionOfVariableRateDebtBasis" id="cmcsa_DescriptionOfVariableRateDebtBasis" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments" id="cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
    <element name="SplitDollarLifeInsuranceAgreementExpense" id="cmcsa_SplitDollarLifeInsuranceAgreementExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
    <element name="ShareExchangeIssuedReceived" id="cmcsa_ShareExchangeIssuedReceived" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="CommonStockDividendsPerShareDeclaredAfterReportingPeriod" id="cmcsa_CommonStockDividendsPerShareDeclaredAfterReportingPeriod" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="StockOptionLiquidityProgramExpirationDating" id="cmcsa_StockOptionLiquidityProgramExpirationDating" type="xbrli:normalizedStringItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="ExcessCashIncomeTaxBenefit" id="cmcsa_ExcessCashIncomeTaxBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="StockOptionLiquidityProgramOutstandingNumber" id="cmcsa_StockOptionLiquidityProgramOutstandingNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice" id="cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="DeferredTaxLiabilityFranchiseRights" id="cmcsa_DeferredTaxLiabilityFranchiseRights" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
    <element name="AeTelevisionNetworksLlcMember" id="cmcsa_AeTelevisionNetworksLlcMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="WeatherChannelMember" id="cmcsa_WeatherChannelMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="MsnbccomMember" id="cmcsa_MsnbccomMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="CarryingAmountOfRedeemablePreferredStock" id="cmcsa_CarryingAmountOfRedeemablePreferredStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
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    <element name="FilmAndTelevisionCosts" id="cmcsa_FilmAndTelevisionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
    <element name="AccruedParticipationsAndResidualsCurrent" id="cmcsa_AccruedParticipationsAndResidualsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
    <element name="FilmAndTelevisionCostsPolicyTextBlock" id="cmcsa_FilmAndTelevisionCostsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice" id="cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests" id="cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest" id="cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="AmortizationOfFilmAndTelevisionCosts" id="cmcsa_AmortizationOfFilmAndTelevisionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
    <element name="ChangeInFilmAndTelevisionCosts" id="cmcsa_ChangeInFilmAndTelevisionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="CableCommunicationsSegmentRevenuePercentageBusinessServicesMember" id="cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="BroadcastTelevisionMember" id="cmcsa_BroadcastTelevisionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="FilmedEntertainmentMember" id="cmcsa_FilmedEntertainmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="ThemeParksMember" id="cmcsa_ThemeParksMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="HeadquartersAndOtherMember" id="cmcsa_HeadquartersAndOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="NbcuniversalEliminationsMember" id="cmcsa_NbcuniversalEliminationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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    <element name="FilmAndTelevisionCostsDisclosureTextBlock" id="cmcsa_FilmAndTelevisionCostsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
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    <element name="FilmAndTelevisionLibraryCostsUnamortized" id="cmcsa_FilmAndTelevisionLibraryCostsUnamortized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
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    <element name="ReceivablesMonetizationTextBlock" id="cmcsa_ReceivablesMonetizationTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock" id="cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="ContingentConsiderationTableTextBlock" id="cmcsa_ContingentConsiderationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="SeniorSubordinated10875NotesDue2016Member" id="cmcsa_SeniorSubordinated10875NotesDue2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="Senior8875NotesDue2015Member" id="cmcsa_Senior8875NotesDue2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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    <element name="TelevisionCostsMember" id="cmcsa_TelevisionCostsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization" id="cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
    <element name="FilmAndTelevisionCostsLineItems" id="cmcsa_FilmAndTelevisionCostsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral" id="cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="IncreaseInAdditionalPaidInCapitalFromIssuanceOfNoncontrollingEquityInterest" id="cmcsa_IncreaseInAdditionalPaidInCapitalFromIssuanceOfNoncontrollingEquityInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="SupplementalFinancialInformationAbstract" id="cmcsa_SupplementalFinancialInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="ReturnsAndIncentivesAllowance" id="cmcsa_ReturnsAndIncentivesAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
    <element name="ProgrammingAndProductionCosts" id="cmcsa_ProgrammingAndProductionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
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    <element name="NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear" id="cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="EquityInterestPercentage" id="cmcsa_EquityInterestPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="VotingInterestPercentage" id="cmcsa_VotingInterestPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
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    <element name="DebtInstrumentMaturityPeriod" id="cmcsa_DebtInstrumentMaturityPeriod" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="CollateralLiabilityForUnconsolidatedSubsidiaryDebt" id="cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
    <element name="UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries" id="cmcsa_UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock" id="cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears" id="cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="AmortizationOfOriginalFilmAndTelevisionProductionExpectedToBeAmortizedDuringNextFiscalYear" id="cmcsa_AmortizationOfOriginalFilmAndTelevisionProductionExpectedToBeAmortizedDuringNextFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
    <element name="FairValueAmountOfRedeemablePreferredShares" id="cmcsa_FairValueAmountOfRedeemablePreferredShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
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    <element name="UncertainAndEffectivelySettledTaxPositionsNetMember" id="cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember" id="cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="PropertyAndEquipmentAndIntangibleAssetsMember" id="cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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    <element name="NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements" id="cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="SubsequentFairValueAdjustments" id="cmcsa_SubsequentFairValueAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
    <element name="ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock" id="cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
    <element name="PrepaidForwardSaleObligationsMember" id="cmcsa_PrepaidForwardSaleObligationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
    <element name="PrepaidForwardSaleObligationsFairValue" id="cmcsa_PrepaidForwardSaleObligationsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
    <element name="PercentageOfCashReceivedFromInvestees" id="cmcsa_PercentageOfCashReceivedFromInvestees" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear" id="cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
    <element name="AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue" id="cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
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    <element name="CashPaidToAcquireEntityIncludingTransactionRelatedCosts" id="cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
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    <element name="PreferredStockDividendResetRatePercentage" id="cmcsa_PreferredStockDividendResetRatePercentage" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
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</schema>
