v2.4.0.8

Receivables Monetization (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Monetization programs payable |  | $ 882
Payments to third-party banks related to the termination of the monetization programs | 1,442 |
Accounts Receivables Monetized And Uncollected At Program Termination Date | 1,078 |
Cash Receipts Collected And Unremitted At Program Termination Date | 364 |
NBCUniversal Media, LLC [Member] |  |
Monetization programs payable |  | 882
Payments to third-party banks related to the termination of the monetization programs | 1,442 |
Accounts Receivables Monetized And Uncollected At Program Termination Date | 1,078 |
Cash Receipts Collected And Unremitted At Program Termination Date | $ 364 |

X
- Definition Represents the amount of accounts receivables that had been monetized and remained uncollected as of the date of the termination of the monetization programs. + References No definition available. + Details
Name: | cmcsa_AccountsReceivablesMonetizedAndUncollectedAtProgramTerminationDate
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the cash receipts that had been collected and not yet remitted to the banks as of the date of the termination of the monetization programs. + References No definition available. + Details
Name: | cmcsa_CashReceiptsCollectedAndUnremittedAtProgramTerminationDate
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents cash receipts that have not yet been remitted to the monetization program as of the balance sheet date and are recorded within accounts payable and accrued expenses related to trade creditors. + References No definition available. + Details
Name: | cmcsa_MonetizationCollectionsOwedUnderProgram
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow associated with the termination of the Company's monetization programs. + References No definition available. + Details
Name: | cmcsa_TerminationPaymentsForMonetizationPrograms
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration