CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 25	$ (480)	$ 129	$ (1,646)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(79)	43	(69)	(134)
Defined benefit plans	3	(14)	9	(15)
Cash flow hedges	(1)	1	(4)	3
Other comprehensive income (loss), net of tax	(77)	30	(64)	(146)
Comprehensive income (loss)	(52)	(450)	65	(1,792)
Less: Comprehensive income (loss) attributable to noncontrolling interests	5	29	52	39
Comprehensive income (loss) attributable to common shareholders	$ (57)	$ (479)	$ 13	$ (1,831)