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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income $ 673 $ 381
Dividend equivalent payments, basic (1) (1)
Dividend equivalent payments, diluted 0 (1)
Income available to common stockholders, basic 672 380
Income available to common stockholders, diluted $ 673 $ 380
Weighted-average shares outstanding (in shares) 251.4 257.3
Dilutive effect of outstanding options and share-settled awards (in shares) 1.2 1.4
Adjusted weighted-average shares outstanding (in shares) 252.6 258.7
Basic (in dollars per share) $ 2.67 $ 1.48
Diluted (in dollars per share) $ 2.66 $ 1.47