CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 17	$ (340)	$ 104	$ (1,166)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	62	42	10	(177)
Defined benefit plans	3	(5)	6	(1)
Cash flow hedges	(1)	4	(3)	2
Other comprehensive income (loss), net of tax	64	41	13	(176)
Comprehensive income (loss)	81	(299)	117	(1,342)
Less: Comprehensive income (loss) attributable to noncontrolling interests	31	17	47	10
Comprehensive income (loss) attributable to common shareholders	$ 50	$ (316)	$ 70	$ (1,352)