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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income $ 3,005 $ 2,013 $ 2,722
Dividend equivalent payments, Basic (2) (3) (5)
Dividend equivalent payments, Diluted 0 (2) 0
Income available to common stockholder's, Basic 3,003 2,010 2,717
Income available to common stockholder's, Diluted $ 3,005 $ 2,011 $ 2,722
Weighted-average shares outstanding, basic (in shares) 246.9 255.1 263.3
Dilutive effect of outstanding options and share-settled awards (in shares) 1.2 1.5 2.3
Adjusted weighted-average shares outstanding, diluted (in shares) 248.1 256.6 265.6
Basic (in dollars per share) $ 12.16 $ 7.88 $ 10.32
Diluted (in dollars per share) $ 12.11 $ 7.84 $ 10.25