Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)		$ (153)	$ 34	$ (169)	$ 60
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	[1]	11	(1)	(6)	(3)
Reclassification adjustment for net losses included in net income (loss)		1		1
Total other comprehensive income (loss), net of tax		12	(1)	(5)	(3)
Comprehensive income (loss)		$ (141)	$ 33	$ (174)	$ 57

[1] The deferred income tax liability related to foreign currency translation adjustments is not material.