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Acquisitions and disposals - divestitures (Details)
£ in Millions, kr in Billions
3 Months Ended 12 Months Ended
Feb. 10, 2022
GBP (£)
Feb. 10, 2022
USD ($)
Sep. 08, 2021
Feb. 26, 2021
GBP (£)
Feb. 26, 2021
USD ($)
Jan. 29, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
SEK (kr)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 26, 2021
USD ($)
Divestments [Line Items]                            
Exploration expenses                     $ 1,004,000,000 $ 3,483,000,000 $ 1,854,000,000  
Net income/(loss) from equity accounted investments                     259,000,000 $ 53,000,000 $ 164,000,000  
Corrib gas project in Ireland [Member]                            
Divestments [Line Items]                            
Consideration receivable from sale of equity interest             $ 434,000,000       $ 434,000,000      
Equinor Energy Ireland [member] | Corrib gas project in Ireland, joint operations [Member]                            
Divestments [Line Items]                            
Proportion of voting rights held in joint operation             36.50%              
Equinor Energy Ireland [member] | Corrib gas project in Ireland [Member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested             100.00%              
Vermilion [Member] | Corrib gas project in Ireland, joint operations [Member]                            
Divestments [Line Items]                            
Proportion of voting rights held in joint operation             20.00%              
Nephin Energy [Member] | Corrib gas project in Ireland, joint operations [Member]                            
Divestments [Line Items]                            
Proportion of voting rights held in joint operation                     43.50%      
Dogger Bank Farm C [Member] | Other disposals of assets [member]                            
Divestments [Line Items]                            
Proportion of voting rights held in joint operation 40.00% 40.00%                        
Dogger Bank Farm C [Member] | SSE [Member] | Other disposals of assets [member]                            
Divestments [Line Items]                            
Proportion of voting rights held in joint operation 40.00% 40.00%                        
Dogger Bank Farm C [Member] | ENI [Member] | Other disposals of assets [member]                            
Divestments [Line Items]                            
Proportion of voting rights held in joint operation 20.00% 20.00%                        
Dogger Bank Farm C [Member] | Renewables [member] | Other disposals of assets [member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested 10.00% 10.00%                        
Proceeds from divesture/sale £ 68.0 $ 92,000,000                        
Equinor Refining Denmark A/S [Member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested                     100.00%      
Proceeds from divesture/sale                     $ 48,000,000      
Proceeds from extraordinary dividend and repayment of paid-in capital                     335,000,000      
Equinor Refining Denmark A/S [Member] | MMP [member]                            
Divestments [Line Items]                            
Gain (loss) on disposal of assets or discontinued operations                     167,000,000      
Terra Nova [Member] | E&P International [member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested     100.00%                      
Bakken onshore unconventional field [Member] | E&P USA [member]                            
Divestments [Line Items]                            
Potential consideration from divestment                           $ 819,000,000
Dogger Bank Wind Farm A and B [member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested       10.00% 10.00%                  
Proportion of ownership interest in associate       40.00% 40.00%                  
Proceeds from divesture/sale       £ 206.4 $ 285,000,000                  
Dogger Bank Wind Farm A and B [member] | SSE [Member]                            
Divestments [Line Items]                            
Proportion of ownership interest in associate       40.00% 40.00%                  
Dogger Bank Wind Farm A and B [member] | ENI [Member]                            
Divestments [Line Items]                            
Proportion of ownership interest in associate       20.00% 20.00%                  
Dogger Bank Wind Farm A and B [member] | Renewables [member]                            
Divestments [Line Items]                            
Gain (loss) on disposal of assets or discontinued operations       £ 202.8 $ 280,000,000                  
Empire Wind and Beacon Wind assets [member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested           50.00%                
Ownership interest in joint venture           50.00%                
Total consideration after adjustments           $ 1,200,000,000                
Prepaid           500,000,000                
Empire Wind and Beacon Wind assets [member] | Renewables [member]                            
Divestments [Line Items]                            
Gain (loss) on disposal of assets or discontinued operations           $ 1,100,000,000                
Divestment of Lundin Petroleum AB shares [Member]                            
Divestments [Line Items]                            
Proportion of ownership interest divested                 4.90% 4.90%        
Gain (loss) on disposal of assets or discontinued operations                   $ (100,000,000)        
Proceeds from divesture/sale                 kr 3.3 $ 300,000,000        
Sea of Okhotsk [Member] | E&P International [member]                            
Divestments [Line Items]                            
Exploration obligations outstanding             $ 0       $ 0      
Exploration expenses               $ 166,000,000