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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income $ 91 $ 126 $ 192 $ 217
Weighted average shares of common stock outstanding (in shares) 66 67 66 69
Basic earnings per share (in dollars per share) $ 1.38 $ 1.88 $ 2.91 $ 3.16
Net income $ 91 $ 126 $ 192 $ 217
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) 67 68 67 70
Diluted earnings per share (in dollars per share) $ 1.37 $ 1.87 $ 2.87 $ 3.13
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect (in shares) 1 1 1 2