Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 24	$ (30)	$ 51	$ (118)
(Loss) income from discontinued operations	(1)	1	(1)	5
Net income (loss)	$ 23	$ (29)	$ 50	$ (113)
Average common shares	108,608,086	107,380,328	108,486,583	106,128,123
Dilutive RSUs, MSUs, performance shares and stock options	2,400,000	0	2,600,000	0
Average diluted common shares	111,008,421	107,380,328	111,052,333	106,128,123
Income (loss) from continuing operations per basic share	$ 0.23	$ (0.29)	$ 0.48	$ (1.11)
Income from discontinued operations per basic share	$ (0.01)	$ 0.01	$ (0.01)	$ 0.04
Basic income (loss) per common share	$ 0.22	$ (0.28)	$ 0.47	$ (1.07)
Income (loss) from continuing operations per diluted share	$ 0.22	$ (0.29)	$ 0.47	$ (1.11)
(Loss) income from discontinued operations per diluted share	$ (0.01)	$ 0.01	$ (0.01)	$ 0.04
Diluted income (loss) per common share	$ 0.21	$ (0.28)	$ 0.46	$ (1.07)