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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Numerator:        
Net income $ 258 $ 228    
Denominator:        
Shares outstanding at the beginning of the period ( in shares)     57.9 58.0
Weighted-average number of shares issued:        
Stock-based compensation (in shares) 0.1 0.1    
Stock purchases (in shares) 0.0 (0.4)    
Denominator for basic net income per share (in shares) 58.0 57.7    
Effect of dilutive securities:        
Stock-based compensation (in shares) 0.7 0.9    
Denominator for diluted net income per share (in shares) 58.7 58.6    
Net income per share:        
Net income per share - Basic (in dollars per share) $ 4.45 $ 3.95    
Net income per share - Diluted (in dollars per share) $ 4.39 $ 3.89