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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, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Income (Numerator):            
Net income for basic and diluted EPS $ 1,317 $ 1,476 $ 464 $ 1,646 $ 2,793 $ 2,110
Shares (Denominator):            
Weighted-average shares for basic EPS (in shares) 535   573   541 575
Effect of dilutive securities (in shares) 2   3   3 3
Weighted-average shares for diluted EPS (in shares) 537   576   544 578
Basic EPS (in usd per share) $ 2.46   $ 0.81   $ 5.16 $ 3.67
Diluted EPS (in usd per share) $ 2.45   $ 0.81   $ 5.13 $ 3.65