CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ 100	$ 387	$ (103)	$ 994
Other comprehensive income (loss):
Foreign currency translation adjustments	163	(182)	(87)	(111)
Derivative instrument adjustments and other, net of tax	(1)	4	2	(2)
Total other comprehensive income (loss), net of tax	162	(178)	(85)	(113)
Comprehensive income (loss)	$ 262	$ 209	$ (188)	$ 881