v3.5.0.2
Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Unrealized gains (losses) on marketable securities $ 3   $ 1
Deferred gains (losses) on cash flow hedges (75)   (11)
Unrecognized gains (losses) on employee benefit obligations 8   (68)
Cumulative translation adjustments 65   (88)
Accumulated other comprehensive income (loss), net of deferred taxes 1 $ (174) (166)
NBCUniversal Media LLC [Member]      
Deferred gains (losses) on cash flow hedges (13)   14
Unrecognized gains (losses) on employee benefit obligations 3   (61)
Cumulative translation adjustments 105   (139)
Accumulated other comprehensive income (loss), net of deferred taxes $ 95 $ (212) $ (186)