Condensed Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 2,535	$ 2,080	$ 5,182	$ 4,304
Unrealized gains (losses) on marketable securities, net of deferred taxes	(87)	1	17	3
Deferred gains (losses) on cash flow hedges, net of deferred taxes	5	(60)	12	(91)
Amounts reclassified to net income:
Realized (gains) losses on marketable securities, net of deferred taxes	0	0	0	(1)
Realized (gains) losses on cash flow hedges, net of deferred taxes	(14)	45	(14)	62
Employee benefit obligations, net of deferred taxes	(6)	0	57	2
Currency translation adjustments, net of deferred taxes	(11)	249	146	487
Comprehensive income	2,422	2,315	5,400	4,766
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(22)	(52)	(103)	(142)
Other comprehensive (income) loss attributable to noncontrolling interests	5	(150)	(82)	(287)
Comprehensive income attributable to Parent	2,405	2,113	5,215	4,337
NBCUniversal Media LLC [Member]
Net income	1,288	975	2,561	2,057
Unrealized gains (losses) on marketable securities, net of deferred taxes	(140)	0	(139)	0
Deferred gains (losses) on cash flow hedges, net of deferred taxes	(8)	6	(22)	(12)
Amounts reclassified to net income:
Employee benefit obligations, net of deferred taxes	(2)	0	104	4
Currency translation adjustments, net of deferred taxes	(11)	307	189	602
Comprehensive income	1,127	1,288	2,693	2,651
Net (income) loss attributable to noncontrolling interests	(12)	(42)	(85)	(122)
Other comprehensive (income) loss attributable to noncontrolling interests	5	(150)	(82)	(287)
Comprehensive income attributable to Parent	$ 1,120	$ 1,096	$ 2,526	$ 2,242