Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)		$ (289)	$ 126	$ 113
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	[1]	28	1	(20)
Reclassification adjustments included in net income (loss), net of tax		1	(2)
Total other comprehensive income (loss), net of tax		29	(1)	(20)
Comprehensive income (loss)		$ (260)	$ 125	$ 93

[1] Deferred income tax liabilities related to these amounts are not material. Prior to January 1, 2019, foreign currency translation adjustments excluded income taxes due to our intention to indefinitely reinvest the earnings of our foreign subsidiaries in those. Refer to “Note 12: Income Taxes” for further information.