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Shareholders' equity and dividends - dividends schedule (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
kr / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
kr / shares
Dividends decared [abstract]        
Dividends declared $ 2,041 $ 2,041 $ 1,833 $ 1,833
Dividend per share | $ / shares $ 0.6300   $ 0.5600  
Dividends paid in cash $ 1,797   $ 2,330  
Dividends paid, ordinary shares per share | (per share) $ 0.5600 $ 4.8078 $ 0.7100 $ 6.7583