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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Income from continuing operations $ 0 $ 98 $ 143 $ 246
Income (loss) from discontinued operations, net of tax 15 0 15 (1)
Net income applicable to common shares $ 15 $ 98 $ 158 $ 245
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Weighted average outstanding shares of common stock (in shares) 168.2 166.2 167.7 165.1
Dilutive effect of employee stock options and restricted stock (in shares) 3.1 3.8 3.4 3.7
Common stock and common stock equivalents (in shares) 171.3 170.0 171.1 168.8
Earnings Per Share, Basic [Abstract]        
Basic earnings from continuing operations (in dollars per share) $ 0.00 $ 0.59 $ 0.85 $ 1.49
Basic earnings from discontinued operations (in dollars per share) $ 0.09 $ 0.00 $ 0.09 $ (0.01)
Basic (in dollars per share) $ 0.09 $ 0.59 $ 0.94 $ 1.48
Earnings Per Share, Diluted [Abstract]        
Diluted earnings from continuing operations (in dollars per share) $ 0.00 $ 0.58 $ 0.84 $ 1.46
Diluted earnings from discontinued operations (in dollars per share) $ 0.09 $ 0.00 $ 0.08 $ (0.01)
Diluted (in dollars per share) $ 0.09 $ 0.58 $ 0.92 $ 1.45