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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 $ 1,380 $ 1,363 $ 1,132 $ 1,474 $ 1,403 $ 1,555 $ 1,570 $ 1,391 $ 5,349 $ 5,919 $ 5,966
Weighted-Average Number Of Shares Outstanding                      
Basic                 677.3 703.5 750.9
Dilutive effect of stock options                 0.8 1.2 1.9
Dilutive effect of retention shares and units                 1.0 1.4 1.5
Diluted                 679.1 706.1 754.3
Earnings per share – basic $ 2.05 $ 2.02 $ 1.67 $ 2.15 $ 2.03 $ 2.22 $ 2.23 $ 1.94 $ 7.90 $ 8.41 $ 7.95
Earnings per share – diluted $ 2.05 $ 2.01 $ 1.67 $ 2.15 $ 2.02 $ 2.22 $ 2.22 $ 1.93 $ 7.88 $ 8.38 $ 7.91
Stock options excluded as their inclusion would be anti-dilutive                 0.3 0.5 0.3