v2.4.1.9

Film and Television Costs (Film and Television Costs)(Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Theatrical film costs |  |
Released, less amortization | $ 1,244 us-gaap_TheatricalFilmCostsReleased | $ 1,371 us-gaap_TheatricalFilmCostsReleased
Completed, not released | 444 us-gaap_TheatricalFilmCostsCompletedAndNotReleased | 71 us-gaap_TheatricalFilmCostsCompletedAndNotReleased
In production and in development | 952 cmcsa_TheatricalFilmCostsInProductionAndInDevelopment | 1,189 cmcsa_TheatricalFilmCostsInProductionAndInDevelopment
Total film costs | 2,640 us-gaap_TheatricalFilmCosts | 2,631 us-gaap_TheatricalFilmCosts
Television costs |  |
Released, less amortization | 1,361 us-gaap_DirectToTelevisionFilmCostsReleased | 1,273 us-gaap_DirectToTelevisionFilmCostsReleased
In production and in development | 407 cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment | 505 cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment
Total television costs | 1,768 us-gaap_DirectToTelevisionFilmCosts | 1,778 us-gaap_DirectToTelevisionFilmCosts
Programming rights, less amortization | 2,174 cmcsa_ProgrammingRightsLessAmortization | 2,157 cmcsa_ProgrammingRightsLessAmortization
Total film costs, television costs and programming rights | 6,582 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization | 6,566 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization
Less: Current portion of programming rights | 945 cmcsa_ProgrammingRightsCurrent | 839 cmcsa_ProgrammingRightsCurrent
Film and television costs | 5,637 cmcsa_FilmAndTelevisionCosts | 5,727 cmcsa_FilmAndTelevisionCosts
NBCUniversal Media, LLC [Member] |  |
Theatrical film costs |  |
Released, less amortization | 1,244 us-gaap_TheatricalFilmCostsReleased / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,371 us-gaap_TheatricalFilmCostsReleased / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Completed, not released | 444 us-gaap_TheatricalFilmCostsCompletedAndNotReleased / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 71 us-gaap_TheatricalFilmCostsCompletedAndNotReleased / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
In production and in development | 952 cmcsa_TheatricalFilmCostsInProductionAndInDevelopment / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,189 cmcsa_TheatricalFilmCostsInProductionAndInDevelopment / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Total film costs | 2,640 us-gaap_TheatricalFilmCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 2,631 us-gaap_TheatricalFilmCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Television costs |  |
Released, less amortization | 1,361 us-gaap_DirectToTelevisionFilmCostsReleased / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,273 us-gaap_DirectToTelevisionFilmCostsReleased / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
In production and in development | 407 cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 505 cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Total television costs | 1,768 us-gaap_DirectToTelevisionFilmCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 1,778 us-gaap_DirectToTelevisionFilmCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Programming rights, less amortization | 2,145 cmcsa_ProgrammingRightsLessAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 2,130 cmcsa_ProgrammingRightsLessAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Total film costs, television costs and programming rights | 6,553 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 6,539 cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Less: Current portion of programming rights | 925 cmcsa_ProgrammingRightsCurrent / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | 825 cmcsa_ProgrammingRightsCurrent / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember
Film and television costs | $ 5,628 cmcsa_FilmAndTelevisionCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember | $ 5,714 cmcsa_FilmAndTelevisionCosts / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember

X
- Definition The amount of direct negative costs incurred in the production and development of a direct-to-television 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 No definition available. + Details
Name: | cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment
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
- 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 production and development of a theatrical 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 No definition available. + Details
Name: | cmcsa_TheatricalFilmCostsInProductionAndInDevelopment
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
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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 direct-to-television 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6473108&loc=d3e54431-107959 + Details
Name: | us-gaap_DirectToTelevisionFilmCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of direct negative costs incurred in the release of a direct-to-television 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6473108&loc=d3e54431-107959 + Details
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Namespace Prefix: | us-gaap_
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 theatrical 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6473108&loc=d3e54431-107959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
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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 theatrical film not yet released. 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6473108&loc=d3e54431-107959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of direct negative costs incurred in the release of a theatrical 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6473108&loc=d3e54431-107959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Period Type: |