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Financial risk and capital management - Credit risk exposure and grading (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of internal credit grades [line items]    
Description of internal credit ratings process Prior to entering into transactions with new counterparties, Equinor’s credit policy requires all counterparties to be formally identified and assigned internal credit ratings. The internal credit ratings reflect Equinor’s assessment of the counterparties' credit risk and are based on a quantitative and qualitative analysis of recent financial statements and other relevant business. All counterparties are re-assessed regularly.  
Non-current financial receivable [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure $ 497 $ 1,057
Trade and other receivables [member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 7,418 7,374
Reclassification of credit exposure   2,368
Non-current derivative financial instruments [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 2,476 1,365
Reclassification of credit exposure   44
Current derivative financial instrument [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 886 578
Reclassification of credit exposure   98
Investment grade, rated A or above [Member] | Non-current financial receivable [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 211 682
Investment grade, rated A or above [Member] | Trade and other receivables [member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 1,954 2,089
Investment grade, rated A or above [Member] | Non-current derivative financial instruments [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 1,850 962
Investment grade, rated A or above [Member] | Current derivative financial instrument [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 465 201
Other investment grade [Member] | Non-current financial receivable [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 24 80
Other investment grade [Member] | Trade and other receivables [member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 2,288 2,409
Other investment grade [Member] | Non-current derivative financial instruments [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 478 358
Other investment grade [Member] | Current derivative financial instrument [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 287 270
Non-investment grade or not rated [Member] | Non-current financial receivable [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 262 296
Non-investment grade or not rated [Member] | Trade and other receivables [member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 3,176 2,876
Non-investment grade or not rated [Member] | Non-current derivative financial instruments [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure 148 44
Non-investment grade or not rated [Member] | Current derivative financial instrument [Member]    
Disclosure of internal credit grades [line items]    
Financial assets subject to credit exposure $ 134 $ 107