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Earnings Per Share (Summary of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income attributable to common shareholders $ 169 $ 132
Weighted-average common shares outstanding for basic earnings per share (in shares) 166,473,073 164,281,692
Employee equity awards (in shares) 3,773,874 4,086,752
Weighted-average common shares outstanding for diluted earnings per share (in shares) 170,246,947 168,368,444
Basic earnings per share (in dollars per share) $ 1.02 $ 0.80
Diluted earnings per share (in dollars per share) $ 0.99 $ 0.78