CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,725	$ 46	$ 2,856
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation gain (loss)	(431)	(323)	208
Unrealized gains (losses) on investments, net	(187)	108	234
Tax (expense) benefit on unrealized gains (losses) on investments, net	56	(37)	(93)
Unrealized gains (losses) on hedging activities, net	(65)	274	(51)
Tax (expense) benefit on unrealized gains (losses) on hedging activities, net	(6)	(7)	2
Other comprehensive income (loss), net of tax	(633)	15	300
Comprehensive income	$ 1,092	$ 61	$ 3,156