Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (2,537)	$ (6,093)	$ (22)
Other comprehensive income (loss):
Currency translation adjustments	(78)	(7)	(292)
Derivative financial instruments, net of tax	23	10	(21)
Change in defined benefit plans, net of tax	(31)	11	(14)
Comprehensive loss	(2,623)	(6,079)	(349)
Net income attributable to noncontrolling interests	5	2	9
Comprehensive loss attributable to Company	$ (2,628)	$ (6,081)	$ (358)