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Pension Plans and Postretirement Benefits (Deferred Compensation Plans) (Details) (Deferred Compensation Plans [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Benefit obligation $ 1,774us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent $ 1,434us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent $ 1,247us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Interest expense 149cmcsa_DeferredCompensationPlansInterestCost 128cmcsa_DeferredCompensationPlansInterestCost 107cmcsa_DeferredCompensationPlansInterestCost
NBCUniversal Media, LLC [Member]
     
Benefit obligation 349us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmcsa_DeferredCompensationPlansMember
/ dei_LegalEntityAxis
= cmcsa_NBCUniversalMediaLLCMember
250us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmcsa_DeferredCompensationPlansMember
/ dei_LegalEntityAxis
= cmcsa_NBCUniversalMediaLLCMember
163us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmcsa_DeferredCompensationPlansMember
/ dei_LegalEntityAxis
= cmcsa_NBCUniversalMediaLLCMember
Interest expense $ 24cmcsa_DeferredCompensationPlansInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmcsa_DeferredCompensationPlansMember
/ dei_LegalEntityAxis
= cmcsa_NBCUniversalMediaLLCMember
$ 18cmcsa_DeferredCompensationPlansInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmcsa_DeferredCompensationPlansMember
/ dei_LegalEntityAxis
= cmcsa_NBCUniversalMediaLLCMember
$ 11cmcsa_DeferredCompensationPlansInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmcsa_DeferredCompensationPlansMember
/ dei_LegalEntityAxis
= cmcsa_NBCUniversalMediaLLCMember