CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)		$ 284	$ (593)	$ 635	$ (1,725)
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)	1
Net gain incurred in period	[1]		4		4
Change in currency translation adjustment					3
Comprehensive income (loss)		$ 285	$ (590)	$ 636	$ (1,718)

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