v2.4.0.8

Receivables Monetization (Tables) | 12 Months Ended
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Dec. 31, 2013
Receivables Monetized and Deferred Consideration |
Receivables Monetized and Deferred Consideration
December 31 (in millions) |  | 2012
Monetized receivables sold | $ | 791
Deferred consideration | $ | 274
NBCUniversal Media, LLC [Member] |
Receivables Monetized and Deferred Consideration |
Receivables Monetized and Deferred Consideration |  |
| Successor
December 31 (in millions) |  | 2012
Monetized receivables sold | $ | 791
Deferred consideration | $ | 274

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- Definition Schedule Of Monetization Balances [Table Text Block] + References No definition available. + Details
Name: | cmcsa_ScheduleOfMonetizationBalancesTableTextBlock
Namespace Prefix: | cmcsa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration