CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (480)	$ 78	$ (1,646)	$ 18
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	43	(97)	(134)	(80)
Cash flow hedges	1	0	3	1
Defined benefit plans	(14)	3	(15)	2
Other comprehensive income (loss), net of tax	30	(94)	(146)	(77)
Comprehensive income (loss)	(450)	(16)	(1,792)	(59)
Less: Comprehensive income (loss) attributable to noncontrolling interests	29	(14)	39	22
Comprehensive income (loss) attributable to common shareholders	$ (479)	$ (2)	$ (1,831)	$ (81)