Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Income from continuing operations	$ (344)	$ 90	$ (304)	$ 143
Income (loss) from discontinued operations, net of tax	0	0	0	0
Net income applicable to common shares	$ (344)	$ 90	$ (304)	$ 143
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average outstanding shares of common stock (in shares)	169.6	167.9	169.3	167.5
Dilutive effect of employee stock options and restricted stock (in shares)	0.0	3.0	0.0	3.5
Earnings Per Share, Basic [Abstract]
Basic earnings from continuing operations (in dollars per share)	$ (2.03)	$ 0.54	$ (1.80)	$ 0.85
Basic earnings from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Basic (in dollars per share)	(2.03)	0.54	(1.80)	0.85
Earnings Per Share, Diluted [Abstract]
Diluted earnings from continuing operations (in dollars per share)	(2.03)	0.53	(1.80)	0.84
Diluted earnings from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Diluted (in dollars per share)	$ (2.03)	$ 0.53	$ (1.80)	$ 0.84
WeightedAverageDilutedSharesOutstanding	172.0		171.8