v2.4.1.9

Consolidated Statement of Changes in Equity (USD $) In Millions | Total | NBCUniversal Media, LLC [Member] | Redeemable Noncontrolling Interests And Redeemable Subisdiary Preferred Stock [Member] | Class A Common Stock [Member] | Class A Special Common Stock [Member] | Class B Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Treasury Stock at Cost [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] NBCUniversal Media, LLC [Member] | Noncontrolling Interests [Member] | Noncontrolling Interests [Member] NBCUniversal Media, LLC [Member] | Redeemable Noncontrolling Interest [Member] NBCUniversal Media, LLC [Member] | Member's Capital [Member] NBCUniversal Media, LLC [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 |  | $ 30,081 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  | $ (78)us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | $ 361 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 184 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | $ 29,798 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Beginning Balance at Dec. 31, 2011 | 47,655 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 16,014 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember | 25 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 7 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_ClassaSpecialCommonStockMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassBMember | 40,940 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 13,971 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (7,517)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (152)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 381 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Stock compensation plans | 372 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  |  |  | 612 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (240)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Repurchases and retirements of common stock | (3,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  | (1)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = cmcsa_ClassaSpecialCommonStockMember |  | (1,081)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (1,918)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Employee stock purchase plans | 80 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan |  |  |  |  |  | 80 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Compensation Plans |  | 7 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  |  |  |  |  | 7 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Other comprehensive income (loss) | 167 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 13 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 6 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  | 167 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 13 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Redemption transaction distribution |  | 0 cmcsa_RedemptionTransactionDistribution / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared | (1,736)us-gaap_DividendsCommonStockCash | (964)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  | (1,736)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  | (964)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Purchase of subsidiary shares from noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | (47)cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember |
Contributions from and (distributions to) noncontrolling interests, net | (169)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests | (184)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | (493)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  |  |  | (169)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (184)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (24)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember |
Other | 76 us-gaap_StockholdersEquityOther | 88 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | (43)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  | (4)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 80 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 84 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 4 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Net income (loss) | 6,351 cmcsa_EquityProfitLoss | 3,213 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,514 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  | 6,203 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 148 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 158 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 18 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | 3,055 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Ending Balance at Dec. 31, 2012 | 49,796 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 16,998 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember | 25 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 6 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_ClassaSpecialCommonStockMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassBMember | 40,547 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 16,280 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (7,517)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 15 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 440 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Ending balance at Dec. 31, 2012 |  | 32,254 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  | (65)us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 419 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 131 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | 31,900 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Stock compensation plans | 232 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  |  |  | 603 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (371)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Repurchases and retirements of common stock | (2,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  | (1)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = cmcsa_ClassaSpecialCommonStockMember |  | (555)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (1,444)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Employee stock purchase plans | 98 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan |  |  |  |  |  | 98 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Compensation Plans |  | 7 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  |  |  |  |  | 7 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Other comprehensive income (loss) | 67 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 49 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  | 67 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 49 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Redemption transaction distribution |  | (3,200)cmcsa_RedemptionTransactionDistribution / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  |  |  |  |  | (3,200)cmcsa_RedemptionTransactionDistribution / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Dividends declared | (2,046)us-gaap_DividendsCommonStockCash | (1,422)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  | (2,046)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  | (1,422)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Purchase of NBCUniversal noncontrolling common equity interest | (1,677)cmcsa_PurchaseOfNoncontrollingCommonEquityInterest |  | (17,006)cmcsa_PurchaseOfNoncontrollingCommonEquityInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  | (1,651)cmcsa_PurchaseOfNoncontrollingCommonEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (26)cmcsa_PurchaseOfNoncontrollingCommonEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interests |  | (33)cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  |  |  |  |  | (33)cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Redeemable subsidiary preferred stock |  |  | 725 cmcsa_SubsidiaryPreferredStock / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Contributions from and (distributions to) noncontrolling interests, net | (136)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests | (155)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | (22)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  |  |  | (136)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (155)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (22)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember |
Other | (210)us-gaap_StockholdersEquityOther | (275)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 70 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  | (152)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (58)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (111)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 102 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | (164)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Net income (loss) | 6,934 cmcsa_EquityProfitLoss | 2,102 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 201 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  | 6,816 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 118 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 134 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 20 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | 1,968 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Ending Balance at Dec. 31, 2013 | 51,058 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 957 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember | 25 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_ClassaSpecialCommonStockMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassBMember | 38,890 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 19,235 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (7,517)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 56 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 364 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Ending balance at Dec. 31, 2013 |  | 29,327 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  | (16)us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 287 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 231 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | 29,056 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Stock compensation plans | 299 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  |  |  | 732 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (433)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Repurchases and retirements of common stock | (4,251)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  |  |  | (928)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (3,323)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |
Employee stock purchase plans | 118 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan |  |  |  |  |  | 118 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (202)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (143)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  | (202)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (143)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Redemption transaction distribution |  | 0 cmcsa_RedemptionTransactionDistribution / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared | (2,320)us-gaap_DividendsCommonStockCash | (1,641)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  | (2,320)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  | (1,641)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Issuance of subsidiary shares to noncontrolling interests | 11 cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest |  | 85 cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  |  |  | 11 cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 85 cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember |
Contributions from and (distributions to) noncontrolling interests, net | (132)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests | (152)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | (19)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  |  |  |  |  | (132)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (152)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (24)cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember |
Other | (29)us-gaap_StockholdersEquityOther | (13)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | (33)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  | (7)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (22)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (12)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | (1)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Net income (loss) | 8,516 cmcsa_EquityProfitLoss | 3,259 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 76 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember |  |  |  |  | 8,380 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 136 cmcsa_EquityProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 144 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 38 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | 3,115 cmcsa_EquityProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember
Ending Balance at Dec. 31, 2014 | 53,068 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 1,066 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember | 25 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = cmcsa_ClassaSpecialCommonStockMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassBMember | 38,805 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 21,539 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (7,517)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (146)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 357 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Ending balance at Dec. 31, 2014 |  | $ 30,637 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |  |  |  |  |  |  |  |  | $ (159)us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | $ 267 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 330 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_RedeemableNoncontrollingInterestMember | $ 30,529 us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember / us-gaap_StatementEquityComponentsAxis = cmcsa_MembersCapitalMember

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