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Related parties - narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 31, 2021
Disclosure of transactions between related parties [line items]        
Amounts payable, related party transactions $ 0 $ 0 $ 0  
Share buyback programme [member] | Share-based Payment Arrangement, Tranche One [member]        
Disclosure of transactions between related parties [line items]        
Agreement to buy treasury shares $ 600,000,000     $ 300,000,000
Equinor ASA [member]        
Disclosure of transactions between related parties [line items]        
Ownership interests held by shareholder 67.00%      
Equinor ASA [member] | Lease liabilities [member]        
Disclosure of transactions between related parties [line items]        
Amounts payable, related party transactions $ 284,000,000      
Related Party Lease Contract Term The lease contracts extend to the years 2034 and 2037      
Equinor ASA [member] | Gassco AS [member]        
Disclosure of transactions between related parties [line items]        
Settlement of liabilities by entity on behalf of related party, related party transactions $ 1,030,000,000.000 896,000,000 1,076,000,000.000  
Norwegian State [member]        
Disclosure of transactions between related parties [line items]        
Amounts receivable, related party transactions 435,000,000 169,000,000    
Norwegian State [member] | Oil and gas assets [member]        
Disclosure of transactions between related parties [line items]        
Purchases of of goods with related party 9,572,000,000 5,108,000,000 7,505,000,000  
Norwegian State [member] | Tjeldbergodden [member]        
Disclosure of transactions between related parties [line items]        
Purchases of of goods with related party $ 88,000,000.000 $ 18,000,000.000 $ 36,000,000.000  
Folketrygdfondet [member]        
Disclosure of transactions between related parties [line items]        
Ownership interests held by shareholder 3.70%