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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, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]            
Net income $ 819 $ 703 $ 819 $ 673 $ 1,522 $ 1,492
Dividend equivalent payments, basic (1)   0   (1) (1)
Dividend equivalent payments, diluted (1)   0   (1) 0
Income available to common stockholders, basic 818   819   1,521 1,491
Income available to common stockholders, diluted $ 818   $ 819   $ 1,521 $ 1,492
Weighted-average shares outstanding (in shares) 236.7   248.9   238.0 250.1
Dilutive effect of outstanding options and share-settled awards (in shares) 0.8   1.1   0.9 1.2
Adjusted weighted-average shares outstanding (in shares) 237.5   250.0   238.9 251.3
Basic (in dollars per share) $ 3.46   $ 3.29   $ 6.39 $ 5.96
Diluted (in dollars per share) $ 3.45   $ 3.28   $ 6.37 $ 5.94