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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Numerator:                
Net income $ 255 $ 298 $ 301 $ 301 $ 553 $ 602    
Denominator:                
Shares outstanding at the beginning of the period (in shares)   53,600   58,100     55,000 57,800
Weighted-average number of shares issued:                
Stock-based compensation (in shares) 0   0   200 200    
Stock purchases (in shares) 0   0   (1,100) 0    
Denominator for basic net income per share (in shares) 53,600   58,100   54,100 58,000    
Effect of dilutive securities:                
Stock-based compensation (in shares) 100   100   200 300    
Denominator for diluted net income per share (in shares) 53,700   58,200   54,300 58,300    
Net income per share:                
Net income per share - Basic (in dollars per share) $ 4.75   $ 5.18   $ 10.23 $ 10.38    
Net income per share - Diluted (in dollars per share) $ 4.75   $ 5.17   $ 10.19 $ 10.33    
Potentially dilutive common shares (in shares) 133   208     140