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Financial investments and financial receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Financial investments $ 4,083 $ 3,600
Prepayments and financial receivables 861 1,214
Financial investments 11,865 7,426
Scatec ASA [Member]    
Disclosure of financial assets [line items]    
Investments in associates accounted for using equity method 831 268
Lundin Petroleum AB [Member]    
Disclosure of financial assets [line items]    
Investments in associates accounted for using equity method   478
Divestment of investment in associates 478  
Bond Investment [Member]    
Disclosure of financial assets [line items]    
Financial investments 1,866 1,629
Listed equity securities [member]    
Disclosure of financial assets [line items]    
Financial investments 1,648 1,261
Non-listed equity securities [member]    
Disclosure of financial assets [line items]    
Financial investments 569 710
Interest bearing financial receivables [member]    
Disclosure of financial assets [line items]    
Prepayments and financial receivables 711 439
Prepayments [Member]    
Disclosure of financial assets [line items]    
Prepayments and financial receivables 118 129
Other non-interest bearing receivables [Member]    
Disclosure of financial assets [line items]    
Prepayments and financial receivables 32 646
Time deposits [member]    
Disclosure of financial assets [line items]    
Financial investments 4,841 4,158
Interest bearing securities [Member]    
Disclosure of financial assets [line items]    
Financial investments 7,010 3,268
Listed Equity Securities [member]    
Disclosure of financial assets [line items]    
Financial investments 13 0
Investment portfolios [Member]    
Disclosure of financial assets [line items]    
Financial investments $ 202 $ 377