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Earnings Per Share (EPS) - Computation of Basic and Diluted EPS Attributable to Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic EPS        
Net income $ 126 $ 46 $ 217 $ 109
Weighted average shares of common stock outstanding (in shares) 67 70 69 70
Basic earnings per share (in dollars per share) $ 1.88 $ 0.65 $ 3.16 $ 1.56
Diluted EPS        
Net income $ 126 $ 46 $ 217 $ 109
Weighted average shares of common stock outstanding (in shares) 67 70 69 70
Dilutive effect of stock options and restricted stock units (in shares) 1 1 1 1
Weighted average shares of common stock outstanding - diluted (in shares) 68 71 70 71
Diluted earnings per share (in dollars per share) $ 1.87 $ 0.64 $ 3.13 $ 1.53
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect ( in shares ) 1 0 2 1