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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]                
Net income $ 711 $ 768 $ 750 $ 1,099 $ 737 $ 53 $ 2,229 $ 1,889
Dividend equivalent payments, basic 0     0     (2) (2)
Dividend equivalent payments, diluted (1)     0     (2) (2)
Income available to common stockholders, basic 711     1,099     2,227 1,887
Income available to common stockholders, diluted $ 710     $ 1,099     $ 2,227 $ 1,887
Weighted-average shares outstanding (in shares) 224.4     226.2     225.2 226.0
Dilutive effect of outstanding options and share-settled awards (in shares) 0.3     0.3     0.3 0.3
Adjusted weighted-average shares outstanding (in shares) 224.7     226.5     225.5 226.3
Earnings per share, basic (in dollars per share) $ 3.16     $ 4.86     $ 9.89 $ 8.35
Earnings per share, diluted (in dollars per share) $ 3.16     $ 4.85     $ 9.88 $ 8.34