v3.4.0.3
Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Unrealized gains (losses) on marketable securities $ 2   $ 1
Deferred gains (losses) on cash flow hedges (60)   (6)
Unrecognized gains (losses) on employee benefit obligations 8   (68)
Cumulative translation adjustments (34)   (115)
Accumulated other comprehensive income (loss), net of deferred taxes (84) $ (174) (188)
NBCUniversal Media LLC [Member]      
Deferred gains (losses) on cash flow hedges (19)   32
Unrecognized gains (losses) on employee benefit obligations 3   (61)
Cumulative translation adjustments (52)   (181)
Accumulated other comprehensive income (loss), net of deferred taxes $ (68) $ (212) $ (210)