CONSOLIDATED STATEMENTS 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	$ 1,503	$ 1,848	$ 273
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	5	(9)	36
Unrealized gains (losses) on forward contracts designated as hedges, net of tax	(15)	38	(44)
Unrealized gains (losses) on investments, net of tax	(8)	5	(1)
Total other comprehensive income (loss)	(18)	34	(9)
Comprehensive income	$ 1,485	$ 1,882	$ 264