Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net Income (Loss)	$ 75	$ (430)
Other Comprehensive Income from Continuing Operations
Losses on treasury rate locks reclassified into income
Pension and other postretirement benefit plans	1	2
Other comprehensive income, before income taxes	1	2
Income tax expense related to other comprehensive income		1
Other comprehensive income from continuing operations, net of income taxes	1	1
Other Comprehensive Income from Discontinued Operations, net of Income Taxes		5
Comprehensive Income (Loss)	$ 76	$ (424)