Condensed Consolidated Statements of Comprehensive Income (Loss) - 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 (loss) income		$ (7)	$ 127	$ (1,999)	$ 124
Net income attributable to noncontrolling interests		(22)	(33)	(97)	(85)
Other comprehensive income:
Reclassification of realized losses on pension and postretirement benefits to income	[1]	0	0	0	1
Comprehensive (loss) income attributable to common stock		$ (29)	$ 94	$ (2,096)	$ 40

[1] No associated tax for the three and nine months ended September 30, 2020 and 2019. See Note 11 Pension and Postretirement Benefit Plans for additional information.