Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidated Statements of Comprehensive Income
Net (loss) income		$ (132)	$ 546	$ (127)	$ 356
Net income attributable to noncontrolling interest		(1)		(1)
Other comprehensive income items:
Reclassification to income of realized losses on pension and postretirement	[1]	1	2	4	8
Total other comprehensive income, net of tax		1	2	4	8
Comprehensive (loss) income attributable to common stock		(132)	548	(124)	364
Pension and postretirement income, associated tax		$ 0	$ 0	$ 0	$ 0

[1] No associated tax for the three and nine months ended September 30, 2017 and 2016. See Note 10 Retirement and Postretirement Benefit Plans, for additional information.