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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]            
Net income $ 737 $ 53 $ 356 $ 466 $ 790 $ 822
Dividend equivalent payments, basic (1)   0   (2) (1)
Dividend equivalent payments, diluted (1)   0   (2) (1)
Income available to common stockholders, basic 736   356   788 821
Income available to common stockholders, diluted $ 736   $ 356   $ 788 $ 821
Weighted-average shares outstanding (in shares) 226.0   227.5   225.9 227.6
Dilutive effect of outstanding options and share-settled awards (in shares) 0.4   0.5   0.4 0.5
Adjusted weighted-average shares outstanding (in shares) 226.4   228.0   226.3 228.1
Earnings per share, basic (in dollars per share) $ 3.26   $ 1.56   $ 3.49 $ 3.61
Earnings per share, diluted (in dollars per share) $ 3.25   $ 1.56   $ 3.48 $ 3.60