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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, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Numerator:                
Net income $ 185 $ 228 $ 276 $ 178 $ 413 $ 454    
Denominator:                
Shares outstanding at the beginning of the period (in shares)   57.7   58.6     58.0 61.9
Weighted-average number of shares issued:                
Stock purchases (in shares) 0.0   0.0   (0.5) (2.5)    
Stock-based compensation (in shares) 0.0   0.0   0.2 0.0    
Denominator for basic net income per share (in shares) 57.7   58.6   57.7 59.4    
Effect of dilutive securities:                
Stock-based compensation (in shares) 0.7   0.8   0.8 0.8    
Denominator for diluted net income per share (in shares) 58.4   59.4   58.5 60.2    
Net income per share:                
Net income per share - Basic (in dollars per share) $ 3.20   $ 4.72   $ 7.14 $ 7.65    
Net income per share - Diluted (in dollars per share) $ 3.16   $ 4.65   $ 7.05 $ 7.54