CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - 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 (LOSS) [Abstract]
Net income (loss)		$ 77	$ (708)	$ 712	$ (2,433)
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost and net loss included in net periodic pension cost	[1]	1	1	2	1
Net gain incurred in period	[1]		1		5
Change in currency translation adjustment					3
Comprehensive income (loss)		$ 78	$ (706)	$ 714	$ (2,424)

[1] Net of tax for the three and nine months ended September 30, 2017 and 2016.