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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Net income $ 753 $ 819 $ 673 $ 569 $ 392 $ 381 $ 2,245 $ 1,342
Dividend equivalent payments, basic (1)     (2)     (2) (3)
Dividend equivalent payments, diluted 0     (1)     0 (2)
Income available to common stockholders, basic 752     567     2,243 1,339
Income available to common stockholders, diluted $ 753     $ 568     $ 2,245 $ 1,340
Weighted-average shares outstanding (in shares) 245.3     254.6     248.5 255.7
Dilutive effect of outstanding options and share-settled awards (in shares) 1.1     1.5     1.2 1.5
Adjusted weighted-average shares outstanding (in shares) 246.4     256.1     249.7 257.2
Basic (in dollars per share) $ 3.07     $ 2.23     $ 9.03 $ 5.24
Diluted (in dollars per share) $ 3.06     $ 2.22     $ 8.99 $ 5.21