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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:        
Net income $ 1,179 $ 1,091 $ 792  
Denominator:        
Shares outstanding at the beginning of the period (in shares)   57,800,000 57,400,000 57,900,000
Weighted-average number of shares issued:        
Stock purchases (in shares) (600,000) 0 (500,000)  
Stock-based compensation (in shares) 200,000 300,000 400,000  
Denominator for basic net income per share (in shares) 57,400,000 57,700,000 57,800,000  
Effect of dilutive securities:        
Stock-based compensation (in shares) 300,000 400,000 700,000  
Denominator for diluted net income per share (in shares) 57,700,000 58,100,000 58,500,000  
Net income per share:        
Net income per share - Basic (in dollars per share) $ 20.52 $ 18.91 $ 13.72  
Net income per share - Diluted (in dollars per share) $ 20.42 $ 18.77 $ 13.55  
Potentially dilutive common shares (in shares) 108,000