v2.4.0.8
Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Unrealized gains (losses) on marketable securities $ 67 $ 182
Deferred gains (losses) on cash flow hedges (45) (67)
Unrecognized gains (losses) on employee benefit obligations 71 (95)
Cumulative translation adjustments (37) (5)
Accumulated other comprehensive income (loss), net of deferred taxes 56 15
NBCUniversal Media, LLC [Member]
   
Deferred gains (losses) on cash flow hedges (5)  
Unrecognized gains (losses) on employee benefit obligations 45 (50)
Cumulative translation adjustments (56) (15)
Accumulated other comprehensive income (loss), net of deferred taxes $ (16) $ (65)