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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Numerator:        
Net income $ 298 $ 301    
Denominator:        
Shares outstanding at the beginning of the period (in shares)     55.0 57.8
Weighted-average number of shares issued:        
Stock-based compensation (in shares) 0.1 0.1    
Stock purchases (in shares) (0.5) 0.0    
Denominator for basic net income per share (in shares) 54.6 57.9    
Effect of dilutive securities:        
Stock-based compensation (in shares) 0.2 0.4    
Denominator for diluted net income per share (in shares) 54.8 58.3    
Net income per share:        
Net income per share - Basic (in dollars per share) $ 5.47 $ 5.21    
Net income per share - Diluted (in dollars per share) $ 5.45 $ 5.17