Consolidated Statements of Comprehensive (Loss) Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (212)	$ 285	$ 257
Other Comprehensive Income (Loss) from Continuing Operations
Losses on treasury rate locks reclassified into income	1		1
Pension and other postretirement benefit plans	13	(14)	(11)
Other comprehensive income (loss), before income taxes	14	(14)	(10)
Income tax expense (benefit) related to other comprehensive income	6	(6)	(4)
Other comprehensive income (loss) from continuing operations, net of income taxes	8	(8)	(6)
Other Comprehensive Income from Discontinued Operations, Net of Income Taxes	6	23	49
Comprehensive (Loss) Income	$ (198)	$ 300	$ 300