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Shareholders' equity and dividends - narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2019
NOK (kr)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
NOK (kr)
$ / shares
shares
Feb. 04, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Total number of shares issued | shares 3,338,661,219   3,338,661,219   3,338,661,219   3,338,661,219
Dividends declared per share | $ / shares $ 0.27            
Increase (decrease) through treasury share transactions, equity   $ (500,000,000)          
United States Dollar (USD) [Member]              
Share capital         $ 1,184,547,766   $ 1,184,547,766
Dividends declared per share | $ / shares   $ 1.04 $ 0.92        
Norwegian kroner (NOK) [Member]              
Share capital | kr $ 8,346,653,047.5   $ 8,346,653,047.5        
Nominal value per share | $ / shares         $ 2.5   $ 2.5
Share buyback programme [Member]              
Treasury shares purchased   $ 442,000,000          
Number of shares outstanding | shares 23,578,410   0   23,578,410   0
Treasury Shares           $ 5,000,000,000  
Share buyback programme [Member] | Share-based Payment Arrangement, Tranche One [Member]              
Increase (decrease) through treasury share transactions, equity   $ (500,000,000)          
Treasury Shares       $ 1,500,000,000      
Agreement to buy treasury shares         $ 500,000,000    
Share buyback programme [Member] | Share-based Payment Arrangement, Tranche One [Member] | Norwegian State [Member]              
Agreement to buy treasury shares         $ 1,000,000,000