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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:        
Net income $ 659 $ 673 $ 737  
Denominator:        
Shares outstanding at the beginning of the period (in shares)   58.0 61.9 62.1
Weighted-average number of shares issued:        
Stock purchases (in shares) (0.5) (3.0) 0.0  
Stock-based compensation (in shares) 0.3 0.1 0.1  
Denominator for basic net income per share (in shares) 57.8 59.0 62.2  
Effect of dilutive securities:        
Share-based compensation (in shares) 0.8 0.9 0.6  
Warrants (in shares) 0.0 0.0 1.4  
Denominator for diluted net income per share (in shares) 58.6 59.9 64.2  
Net income per share:        
Net income per share - Basic (in dollars per share) $ 11.40 $ 11.40 $ 11.85  
Net income per share - Diluted (in dollars per share) $ 11.25 $ 11.23 $ 11.47