CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 482	$ 626
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation gain (loss)	154	(265)
Unrealized gains (losses) on investments, net	23	(22)
Tax benefit (expense) on unrealized gains (losses) on investments, net	(21)	9
Unrealized gains (losses) on hedging activities, net	3	89
Tax benefit (expense) on unrealized gains (losses) on hedging activities, net	0	2
Other comprehensive income (loss), net of tax	159	(191)
Comprehensive income (loss)	$ 641	$ 435