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Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Numerator:        
Net income $ 228 $ 178    
Denominator:        
Shares outstanding at the beginning of the period (in shares)     58.0 61.9
Weighted-average number of shares issued:        
Stock purchases (in shares) (0.4) (1.7)    
Stock-based compensation (in shares) 0.1 0.0    
Denominator for basic net income per share (in shares) 57.7 60.2    
Effect of dilutive securities:        
Stock-based compensation (in shares) 0.9 0.7    
Warrants (in shares) 0.0 0.1    
Denominator for diluted net income per share (in shares) 58.6 61.0    
Net income per share:        
Net income per share - Basic (in dollars per share) $ 3.95 $ 2.95    
Net income per share - Diluted (in dollars per share) $ 3.89 $ 2.92