CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (74)	$ (5)
Net change in unrealized gains (losses), net of tax, on:
Derivatives designated as cash flow hedges	8	11
Pension and postretirement benefit plan adjustments	(1)	0
Other comprehensive income, net of tax	7	11
Total comprehensive income (loss)	$ (67)	$ 6