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Income taxes - Reconciliation of statutory tax rate to effective tax rate (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Income/(loss) before tax   $ 31,583 $ (4,259) $ 9,292
Calculated income tax at statutory rate   (7,053) 1,445 (2,284)
Calculated Norwegian Petroleum tax   (17,619) (2,126) (5,499)
Tax effect uplift   914 1,006 632
Tax effect of permanent differences regarding divestments   90 (9) 380
Tax effect of permanent differences caused by functional currency different from tax currency   150 (198) 8
Tax effect of other permanent differences   228 450 395
Recognition of previously unrecognised deferred tax assets   126 130 0
Change in unrecognised deferred tax assets   619 (1,685) (974)
Change in tax regulations   4 (12) (6)
Prior period adjustments   (88) 408 47
Other items including currency effects   (378) (647) (139)
Income tax expense   $ (23,007) $ (1,237) $ (7,441)
Effective tax rate   72.80% (29.00%) 80.10%
Statutory tax rate   22.30% 33.90% 24.60%
Allowable uplift rate over a period of four years   5.20%    
Unrecognised uplift credits   $ 272 $ 836  
Uplift rate, for investments subject to transitional rules   7.50%    
Uplift rate   24.00% 5.20% 5.30%
Norway [member]        
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Petroleum tax rate (56.00%) 56.00% 56.00%  
Minimum [member]        
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Uplift rate   20.80%    
Minimum [member] | ForeignCountriesMember        
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Statutory tax rate   22.00%