CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (340)	$ 45	$ (1,166)	$ (60)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	42	(18)	(177)	17
Cash flow hedges	4	(3)	2	1
Defined benefit plans	(5)	(2)	(1)	(1)
Other comprehensive income (loss), net of tax	41	(23)	(176)	17
Comprehensive income (loss)	(299)	22	(1,342)	(43)
Less: Comprehensive income (loss) attributable to noncontrolling interests	17	18	10	36
Comprehensive income (loss) attributable to common shareholders	$ (316)	$ 4	$ (1,352)	$ (79)