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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Numerator:                    
Net income $ 245 $ 309 $ 321 $ 230 $ 248 $ 258 $ 875 $ 736    
Denominator:                    
Shares outstanding at the beginning of the period (in shares)   57.8     57.6       57.4 57.9
Weighted-average number of shares issued:                    
Stock-based compensation (in shares) 0.0     0.0     0.3 0.2    
Stock purchases (in shares) 0.0     0.0     0.0 (0.3)    
Denominator for basic net income per share (in shares) 57.8     57.6     57.7 57.8    
Effect of dilutive securities:                    
Stock-based compensation (in shares) 0.3     0.7     0.4 0.7    
Denominator for diluted net income per share (in shares) 58.1     58.3     58.1 58.5    
Net income per share:                    
Net income per share - Basic (in dollars per share) $ 4.24     $ 4.00     $ 15.18 $ 12.74    
Net income per share - Diluted (in dollars per share) $ 4.21     $ 3.95     $ 15.08 $ 12.58