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Earnings Per Share (Summary of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Net income attributable to common shareholders $ 108 $ 428 $ 414
Weighted-average common shares outstanding for basic earnings per share (in shares) 165,182,290 167,285,450 168,926,733
Employee equity awards (in shares) 3,258,136 3,638,981 3,727,839
Contingent issuance of common stock (in shares) 360,571 358,840 364,277
Weighted-average common shares outstanding for diluted earnings per share (in shares) 168,800,997 171,283,271 173,018,849
Basic earnings per share (in dollars per share) $ 0.65 $ 2.56 $ 2.45
Diluted earnings per share (in dollars per share) $ 0.64 $ 2.50 $ 2.39