CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 523	$ 413	$ 1,585	$ 1,330
Other comprehensive income, net of reclassification adjustments:
Foreign currency translation gain (loss)	115	150	791	217
Unrealized gains (losses) on investments, net	7	353	(42)	657
Tax benefit (expense) on unrealized gains (losses) on investments, net	(2)	(128)	16	(229)
Unrealized gains (losses) on hedging activities, net	(24)	0	(122)	33
Tax benefit (expense) on unrealized gains (losses) on hedging activities, net	5	0	19	0
Other comprehensive income, net of tax	101	375	662	678
Comprehensive income	$ 624	$ 788	$ 2,247	$ 2,008