CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 402	$ 642	$ 920	$ 1,049
Other comprehensive income, net of reclassification adjustments:
Foreign currency translation gain (loss)	(20)	(325)	(52)	(193)
Unrealized gains (losses) on investments, net	16	(2)	56	(38)
Tax benefit (expense) on unrealized gains (losses) on investments, net	(5)	0	(15)	10
Unrealized gains (losses) on hedging activities, net	11	137	(30)	108
Tax benefit (expense) on unrealized gains (losses) on hedging activities, net	(2)	(29)	7	(23)
Other comprehensive income/(loss), net of tax	0	(219)	(34)	(136)
Comprehensive income	$ 402	$ 423	$ 886	$ 913