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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net income $ 671 $ 569 $ 392 $ 381 $ 666 $ 657 $ 722 $ 677 $ 2,013 $ 2,722 $ 2,666
Dividend equivalent payments, Basic                 (3) (5) (6)
Dividend equivalent payments, Diluted                 (2) 0 (1)
Income available to common stockholder's, Basic                 2,010 2,717 2,660
Income available to common stockholder's, Diluted                 $ 2,011 $ 2,722 $ 2,665
Weighted-average shares outstanding, basic (in shares)                 255.1 263.3 277.7
Dilutive effect of outstanding options and share-settled awards (in shares)                 1.5 2.3 2.5
Adjusted weighted-average shares outstanding, diluted (in shares)                 256.6 265.6 280.2
Basic (in dollars per share) $ 2.65 $ 2.23 $ 1.53 $ 1.48 $ 2.56 $ 2.50 $ 2.72 $ 2.53 $ 7.88 $ 10.32 $ 9.58
Diluted (in dollars per share) $ 2.64 $ 2.22 $ 1.53 $ 1.47 $ 2.55 $ 2.49 $ 2.70 $ 2.51 $ 7.84 $ 10.25 $ 9.51