CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (220)	$ 111	$ 265
Other comprehensive income (loss)—net of tax
Foreign currency translation adjustments	16	(134)	106
Defined benefit plans	(45)	(22)	17
Other comprehensive income (loss), net of tax	(29)	(156)	123
Comprehensive income (loss)	(249)	(45)	388
Less: Comprehensive income (loss) attributable to noncontrolling interests	104	54	69
Comprehensive income (loss) attributable to common shareholders	$ (353)	$ (99)	$ 319