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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 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]            
Net income $ 356 $ 466 $ 819 $ 703 $ 822 $ 1,522
Dividend equivalent payments, basic 0   (1)   (1) (1)
Dividend equivalent payments, diluted 0   (1)   (1) (1)
Income available to common stockholders, basic 356   818   821 1,521
Income available to common stockholders, diluted $ 356   $ 818   $ 821 $ 1,521
Weighted-average shares outstanding (in shares) 227.5   236.7   227.6 238.0
Dilutive effect of outstanding options and share-settled awards (in shares) 0.5   0.8   0.5 0.9
Adjusted weighted-average shares outstanding (in shares) 228.0   237.5   228.1 238.9
Basic (in dollars per share) $ 1.56   $ 3.46   $ 3.61 $ 6.39
Diluted (in dollars per share) $ 1.56   $ 3.45   $ 3.60 $ 6.37