v2.4.0.8

Commitments and Contingencies (Rental expense) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 28, 2011 NBCUniversal Media, LLC [Member] | Dec. 31, 2011 NBCUniversal Media, LLC [Member] | Dec. 31, 2013 NBCUniversal Media, LLC [Member] | Dec. 31, 2012 NBCUniversal Media, LLC [Member]
Rent expense | $ 616 | $ 688 | $ 570 | $ 18 | $ 267 | $ 250 | $ 317

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration