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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]                
Net income $ 478 $ 356 $ 466 $ 958 $ 819 $ 703 $ 1,300 $ 2,480
Dividend equivalent payments, basic (1)     0     (2) (1)
Dividend equivalent payments, diluted (1)     0     (2) (1)
Income available to common stockholders, basic 477     958     1,298 2,479
Income available to common stockholders, diluted $ 477     $ 958     $ 1,298 $ 2,479
Weighted-average shares outstanding (in shares) 226.4     233.2     227.2 236.4
Dilutive effect of outstanding options and share-settled awards (in shares) 0.6     0.8     0.6 0.8
Adjusted weighted-average shares outstanding (in shares) 227.0     234.0     227.8 237.2
Basic (in dollars per share) $ 2.11     $ 4.11     $ 5.71 $ 10.49
Diluted (in dollars per share) $ 2.10     $ 4.10     $ 5.70 $ 10.45