CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 7,266	$ 1,725	$ 46
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation loss	(185)	(431)	(323)
Unrealized gains (losses) on investments, net	(794)	(187)	108
Tax (expense) benefit on unrealized gains (losses) on investments, net	314	56	(37)
Unrealized gains (losses) on hedging activities, net	18	(65)	274
Tax (expense) benefit on unrealized gains (losses) on hedging activities, net	(3)	(6)	(7)
Other comprehensive income (loss), net of tax	(650)	(633)	15
Comprehensive income	$ 6,616	$ 1,092	$ 61