CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,786	$ 2,530	$ (1,017)
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation adjustment	(99)	(286)	978
Unrealized gains (losses) on investments, net	61	(41)	(66)
Tax benefit (expense) on unrealized gains (losses) on investments, net	(16)	10	23
Unrealized gains (losses) on hedging activities, net	(77)	125
Unrealized gains (losses) on hedging activities, net			(111)
Tax benefit (expense) on unrealized gains (losses) on hedging activities, net	17	(27)
Tax benefit (expense) on unrealized gains (losses) on hedging activities, net			(17)
Other comprehensive income (loss), net of tax	(114)	(219)	841
Comprehensive income (loss)	$ 1,672	$ 2,311	$ (176)