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Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Numerator:                    
Net income $ 185 $ 276 $ 178 $ 175 $ 196 $ 198 $ 639 $ 569    
Denominator:                    
Shares outstanding at the beginning of the period (in shares)   58.7     62.2       61.9 62.1
Weighted-average number of shares issued:                    
Stock purchases (in shares) 0.0     0.0     (2.8) 0.0    
Stock-based compensation (in shares) 0.0     0.0     0.1 0.1    
Denominator for basic net income per share (in shares) 58.7     62.2     59.2 62.2    
Effect of dilutive securities:                    
Warrants (in shares) 0.0     0.8     0.0 1.8    
Stock-based compensation (in shares) 0.9     0.6     0.8 0.6    
Denominator for diluted net income per share (in shares) 59.6     63.6     60.0 64.6    
Net income per share:                    
Net income per share - Basic (in dollars per share) $ 3.14     $ 2.81     $ 10.80 $ 9.15    
Net income per share - Diluted (in dollars per share) $ 3.10     $ 2.75     $ 10.65 $ 8.80