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Earnings Per Share (EPS) - Computation of Basic and Diluted EPS Attributable to Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Basic EPS        
Net income $ 55 $ 51 $ 164 $ 163
Weighted average shares of common stock outstanding (in shares) 69,612,362 70,556,877 69,740,956 70,353,597
Basic earnings per share (in dollars per share) $ 0.80 $ 0.73 $ 2.35 $ 2.32
Diluted EPS        
Net income $ 55 $ 51 $ 164 $ 163
Weighted average shares of common stock outstanding (in shares) 69,612,362 70,556,877 69,740,956 70,353,597
Dilutive effect of stock options and restricted stock units (in shares) 1,000,000 2,000,000 1,000,000 2,000,000
Weighted average shares of common stock outstanding (in shares) 70,972,874 72,599,944 71,069,852 72,388,598
Diluted earnings per share (in dollars per share) $ 0.78 $ 0.71 $ 2.31 $ 2.25
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect ( in shares ) 0 0 1,000,000 1,000,000