v2.4.1.9

Film and Television Costs (Film and Television Costs)(Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Film And Television Costs [Line Items] |  |
Programming rights, less amortization | $ 2,157 cmcsa_ProgrammingRightsLessAmortization | $ 2,039 cmcsa_ProgrammingRightsLessAmortization
Total film costs, television costs and programming rights | 6,566 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization | 5,922 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization
Less: Current portion of programming rights | 839 cmcsa_ProgrammingRightsCurrent | 928 cmcsa_ProgrammingRightsCurrent
Film and television costs | 5,727 cmcsa_FilmAndTelevisionCosts | 4,994 cmcsa_FilmAndTelevisionCosts
NBCUniversal Media, LLC [Member] |  |
Film And Television Costs [Line Items] |  |
Programming rights, less amortization | 2,130 cmcsa_ProgrammingRightsLessAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 2,003 cmcsa_ProgrammingRightsLessAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Total film costs, television costs and programming rights | 6,539 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 5,886 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Less: Current portion of programming rights | 825 cmcsa_ProgrammingRightsCurrent / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 903 cmcsa_ProgrammingRightsCurrent / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Film and television costs | 5,714 cmcsa_FilmAndTelevisionCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 4,983 cmcsa_FilmAndTelevisionCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Film Costs [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,371 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember | 1,630 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember
Completed, not released | 71 cmcsa_CompletedAndNotReleased / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember | 70 cmcsa_CompletedAndNotReleased / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember
In production and in development | 1,189 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember | 658 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember
Total film costs | 2,631 us-gaap_FilmCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember | 2,358 us-gaap_FilmCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember
Film Costs [Member] | NBCUniversal Media, LLC [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,371 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,630 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Completed, not released | 71 cmcsa_CompletedAndNotReleased / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 70 cmcsa_CompletedAndNotReleased / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
In production and in development | 1,189 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 658 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Total film costs | 2,631 us-gaap_FilmCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 2,358 us-gaap_FilmCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_FilmCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Television Costs [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,273 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember | 1,155 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember
In production and in development | 505 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember | 370 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember
Total television costs | 1,778 cmcsa_TelevisionCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember | 1,525 cmcsa_TelevisionCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember
Television Costs [Member] | NBCUniversal Media, LLC [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,273 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,155 cmcsa_ReleasedLessAmortization / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
In production and in development | 505 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 370 cmcsa_InProductionAndInDevelopment / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Total television costs | $ 1,778 cmcsa_TelevisionCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | $ 1,525 cmcsa_TelevisionCosts / cmcsa_FilmAndTelevisionCostsAxis = cmcsa_TelevisionCostsMember / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember

X
- Definition The amount of direct negative costs incurred as well as allocations of production overhead and capitalized interest related to the completion of a film or television production not yet released. + References No definition available. + Details
Name: | cmcsa_CompletedAndNotReleased
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of owned films, television series and other television productions and noncurrent acquired television and cable networks programming rights recorded on the balance sheet. Owned films, television series and other television production costs include capitalizable production costs, including direct costs, production overhead, print costs, development costs and interest. Film and television rights include multi-year programming arrangements, acquired movies, series and other programs. The carrying amount is stated at the lower of cost, less accumulated amortization, or net realizable/fair value at the balance sheet date. + References No definition available. + Details
Name: | cmcsa_FilmAndTelevisionCosts
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | cmcsa_FilmAndTelevisionCostsLineItems
Namespace Prefix: | cmcsa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of direct negative costs incurred in the production and development of a film or television production, as well as allocations of production overhead and capitalized interest. Examples of direct negative costs include costs of story and scenario; compensation of cast, directors, producers, extras, and miscellaneous staff; costs of set construction and operations, wardrobe, and accessories; costs of sound synchronization; rental facilities on location; and postproduction costs such as music, special effects, and editing. + References No definition available. + Details
Name: | cmcsa_InProductionAndInDevelopment
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The current portion of acquired television and cable networks programming rights recorded on the balance sheet. Includes multi-year programming arrangements, acquired movies, series and other programs. Carrying amount is stated at the lower of cost, less accumulated amortization, or net realizable value at the balance sheet date. + References No definition available. + Details
Name: | cmcsa_ProgrammingRightsCurrent
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of total acquired programming rights, less amortization. + References No definition available. + Details
Name: | cmcsa_ProgrammingRightsLessAmortization
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of direct negative costs incurred in the release of a film or television production, as well as allocations of production overhead and capitalized interest. + References No definition available. + Details
Name: | cmcsa_ReleasedLessAmortization
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of total television costs net of amortization. + References No definition available. + Details
Name: | cmcsa_TelevisionCosts
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of owned films, television series and other television productions and the current and noncurrent portion of acquired television and cable networks programming rights recorded on the balance sheet. Owned films, television series and other television production costs include capitalizable production costs, production overhead, interest, development costs and acquired production costs. Film and television rights include multi-year programming arrangements, acquired movies, series and other programs. The carrying amount is stated at the lower of cost, less accumulated amortization, or net realizable/fair value at the balance sheet date. + References No definition available. + Details
Name: | cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of direct negative costs incurred in the physical production of a film, as well as allocations of production overhead and capitalized interest. Examples of direct negative costs include costs of story and scenario; compensation of cast, directors, producers, extras, and miscellaneous staff; costs of set construction and operations, wardrobe, and accessories; costs of sound synchronization; rental facilities on location; and postproduction costs such as music, special effects, and editing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473103&loc=d3e54369-107958 + Details
Name: | us-gaap_FilmCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | cmcsa_FilmAndTelevisionCostsAxis=cmcsa_FilmCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cmcsa_FilmAndTelevisionCostsAxis=cmcsa_TelevisionCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cmcsa_NBCUniversalMediaLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |