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Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Numerator:                
Net income $ 276 $ 178 $ 196 $ 198 $ 454 $ 394    
Denominator:                
Shares outstanding at the beginning of the period (in shares)   58.6   62.1     61.9 62.1
Weighted-average number of shares issued:                
Stock purchases (in shares) 0.0   0.0   (2.5) 0.0    
Denominator for net income per share, basic (in shares) 58.6   62.1   59.4 62.1    
Effect of dilutive securities:                
Warrants (in shares) 0.0   1.3   0.0 2.4    
Stock-based compensation (in shares) 0.8   0.6   0.8 0.6    
Denominator for net income per share, diluted (in shares) 59.4   64.0   60.2 65.1    
Net income per share:                
Basic (in dollars per share) $ 4.72   $ 3.15   $ 7.65 $ 6.34    
Diluted (in dollars per share) $ 4.65   $ 3.06   $ 7.54 $ 6.04