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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Numerator:                    
Net income $ 326 $ 301 $ 301 $ 245 $ 309 $ 321 $ 928 $ 875    
Denominator:                    
Shares outstanding at the beginning of the period (in shares)   58,100     57,800       57,800 57,400
Weighted-average number of shares issued:                    
Stock-based compensation (in shares) 0     0     200 300    
Stock purchases (in shares) (500)     0     (200) 0    
Denominator for basic net income per share (in shares) 57,600     57,800     57,800 57,700    
Effect of dilutive securities:                    
Stock-based compensation (in shares) 100     300     300 400    
Denominator for diluted net income per share (in shares) 57,700     58,100     58,100 58,100    
Net income per share:                    
Net income per share - Basic (in dollars per share) $ 5.67     $ 4.24     $ 16.05 $ 15.18    
Net income per share - Diluted (in dollars per share) $ 5.65     $ 4.21     $ 15.97 $ 15.08    
Potentially dilutive common shares (in shares) 196           102