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Shareholders' equity and dividends - dividends schedule (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dividends decared [abstract]      
Dividends declared $ 1,833 $ 1,833 $ 3,453
Dividend per share $ 0.12    
Dividends paid in cash   $ 2,330 $ 3,342
Number of shares issued - scrip 0.0 0.0 0.0
Sum dividends settled   $ 2,330 $ 3,342
United States Dollar (USD) [Member]      
Dividends decared [abstract]      
Dividend per share   $ 0.56 $ 1.04
Dividends paid, ordinary shares per share   0.71 1.01
Norwegian kroner (NOK) [Member]      
Dividends decared [abstract]      
Dividends paid, ordinary shares per share   $ 6.7583 $ 8.9664