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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, 2019
Dec. 31, 2019
Dec. 31, 2018
Dividends decared [abstract]      
Dividends declared $ 3,453 $ 3,453 $ 3,064
Dividend per share $ 0.27    
Dividends paid in cash   3,342 2,672
Scrip dividends   $ 0 $ 338
Number of shares issued - scrip 0.0 0.0 15.5
Sum dividends settled   $ 3,342 $ 3,010
United States Dollar (USD) [Member]      
Dividends decared [abstract]      
Dividend per share   $ 1.04 $ 0.92
Dividends paid, ordinary shares per share   1.01 0.9101
Norwegian kroner (NOK) [Member]      
Dividends decared [abstract]      
Dividends paid, ordinary shares per share   $ 8.9664 $ 7.4907