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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net Income (Loss) Available to Common Stockholders, Diluted $ (51) $ (9)
Weighted Average Number of Shares Outstanding, Diluted 96,300,000 106,100,000
Diluted $ (0.53) $ (0.09)
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.8 800,000