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Financial risk and capital management - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Core_Banks
Dec. 31, 2019
USD ($)
Disclosure of offsetting of financial assets [line items]    
Lease Liabilities $ 4,405 $ 4,339
Statoil's Captive Insurance Company [Member]    
Disclosure of offsetting of financial assets [line items]    
Cash held as collateral 627 791
Liquidity risk [member]    
Disclosure of offsetting of financial assets [line items]    
Commercial Papers Programme 5,000  
Revolving credit facility $ 5,000  
Number of banks | Core_Banks 21  
Credit facility maturity date maturing in 2022  
Description of strategy for managing liquidity risk Equinor raises debt in all major capital markets (USA, Europe and Asia) for long-term funding purposes. The policy is to have a maturity profile with repayments not exceeding 5% of capital employed in any year for the nearest five years.  
Maximum Percentage Of Repayment Of Long Term Funding 5.00%  
Maturity Profile Of Debt Funding Repayment 5 years  
Non-current liabilities weighted average maturity 10 years  
Credit risk [member]    
Disclosure of offsetting of financial assets [line items]    
Cash held as collateral $ 1,704 585
Liabilities not offsetting under netting arrangements 387 603
Financial instruments offset under netting arrangements $ 3,738 1,661
Trade and other receivables [member] | Credit risk [member]    
Disclosure of offsetting of financial assets [line items]    
Percentage of overdue trade and other receivables for 30 days and more 2.00%  
Financial instruments offset under netting arrangements $ 1,684 $ 1,309