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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 |  |  |  |  |  |

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