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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net income $ 33 $ 55 $ 250 $ 164
Weighted average shares of common stock outstanding (in shares) 67 70 68 70
Basic earnings per share (in dollars per share) $ 0.49 $ 0.80 $ 3.69 $ 2.35
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 69 71
Diluted earnings per share (in dollars per share) $ 0.48 $ 0.78 $ 3.66 $ 2.31
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect ( in shares ) 0 0 1 1