Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (549)	$ 76
Defined benefit plans:
Amortization of unrecognized amounts included in net periodic benefit costs	12	11
Foreign exchange losses	(5)	0
Other comprehensive income	7	11
Total comprehensive (loss) income	(542)	87
Total comprehensive loss (income) attributable to noncontrolling interests	59	(45)
Total comprehensive income (loss)	$ (483)	$ 42