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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]            
Net income $ 819 $ 673 $ 392 $ 381 $ 1,492 $ 773
Dividend equivalent payments, basic 0   0   (1) (1)
Dividend equivalent payments, diluted 0   0   0 (1)
Income available to common stockholders, basic 819   392   1,491 772
Income available to common stockholders, diluted $ 819   $ 392   $ 1,492 $ 772
Weighted-average shares outstanding (in shares) 248.9   255.4   250.1 256.3
Dilutive effect of outstanding options and share-settled awards (in shares) 1.1   1.3   1.2 1.4
Adjusted weighted-average shares outstanding (in shares) 250.0   256.7   251.3 257.7
Basic (in dollars per share) $ 3.29   $ 1.53   $ 5.96 $ 3.01
Diluted (in dollars per share) $ 3.28   $ 1.53   $ 5.94 $ 3.00