Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 327	$ 242	$ (212)
Other Comprehensive Income (Loss) from Continuing Operations
Losses on treasury rate locks reclassified into income	1	1	1
Pension and other postretirement benefit plans	15	(20)	13
Other comprehensive income (loss), before income taxes	16	(19)	14
Income tax expense (benefit) related to other comprehensive income	6	(7)	6
Other comprehensive income (loss) from continuing operations, net of income taxes	10	(12)	8
Other Comprehensive Income from Discontinued Operations, Net of Income Taxes			6
Comprehensive Income (Loss)	$ 337	$ 230	$ (198)