v2.4.0.8

Film and Television Costs (Film and Television Costs)(Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Film And Television Costs [Line Items] |  |
Programming rights, less amortization | $ 2,089 | $ 2,039
Total film costs, television costs and programming rights | 6,113 | 5,922
Less: Current portion of programming rights | 905 | 928
Film and television costs | 5,208 | 4,994
NBCUniversal Media, LLC [Member] |  |
Film And Television Costs [Line Items] |  |
Programming rights, less amortization | 2,065 | 2,003
Total film costs, television costs and programming rights | 6,089 | 5,886
Less: Current portion of programming rights | 889 | 903
Film and television costs | 5,200 | 4,983
Film Costs [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,356 | 1,630
Completed, not released | 65 | 70
In production and in development | 1,077 | 658
Total film costs | 2,498 | 2,358
Film Costs [Member] | NBCUniversal Media, LLC [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,356 | 1,630
Completed, not released | 65 | 70
In production and in development | 1,077 | 658
Total film costs | 2,498 | 2,358
Television Costs [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,165 | 1,155
In production and in development | 361 | 370
Total television costs | 1,526 | 1,525
Television Costs [Member] | NBCUniversal Media, LLC [Member] |  |
Film And Television Costs [Line Items] |  |
Released, less amortization | 1,165 | 1,155
In production and in development | 361 | 370
Total television costs | $ 1,526 | $ 1,525

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