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Basis of presentation and significant accounting policies and practices - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic EPS:        
Net income $ 1,931 $ 1,380 $ 3,684 $ 2,554
Income allocated to RSUs (7) (7) (15) (13)
Income allocated to common stock for basic EPS $ 1,924 $ 1,373 $ 3,669 $ 2,541
Weighted average number of shares outstanding, basic (in shares) 923 916 923 923
Basic (in dollars per share) $ 2.08 $ 1.50 $ 3.98 $ 2.75
Dilutive effect of stock compensation plans (in shares) 14 11 13 12
Diluted EPS:        
Net income $ 1,931 $ 1,380 $ 3,684 $ 2,554
Income allocated to RSUs (7) (7) (15) (13)
Income allocated to common stock for diluted EPS $ 1,924 $ 1,373 $ 3,669 $ 2,541
Weighted average number of shares outstanding, diluted (in shares) 937 927 936 935
Diluted (in dollars per share) $ 2.05 $ 1.48 $ 3.92 $ 2.72