CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 435	$ 83	$ 917	$ 709
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation gain (loss)	(87)	21	67	(244)
Unrealized gains (losses) on investments, net	281	144	304	122
Tax benefit (expense) on unrealized gains (losses) on investments, net	(80)	(53)	(101)	(44)
Unrealized gains (losses) on hedging activities, net	30	(152)	33	(63)
Tax benefit (expense) on unrealized gains (losses) on hedging activities, net	0	2	0	0
Other comprehensive income (loss), net of tax	144	(38)	303	(229)
Comprehensive income	$ 579	$ 45	$ 1,220	$ 480