CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 105	$ (174)	$ 262	$ (99)
Other comprehensive income (loss) before tax:
Change in cumulative translation adjustments	37	27	(27)	(75)
Net change in unrealized components of defined benefit plans	1	3	3	4
Other comprehensive income (loss), before tax	38	30	(24)	(71)
Tax effect allocated to other comprehensive loss	0	(1)	(1)	(1)
Other comprehensive income (loss), net of tax	38	29	(25)	(72)
Total comprehensive income (loss)	143	(145)	237	(172)
Less: Comprehensive income attributable to non-controlling interest	1	1	1	0
Comprehensive income (loss) attributable to controlling interest	$ 142	$ (146)	$ 236	$ (172)