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Acquisitions and disposals- Divestures (Details) £ in Millions, $ in Millions |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 10, 2021 | Feb. 26, 2021 GBP (£) | Feb. 26, 2021 USD ($) | Jan. 29, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Bakken onshore unconventional field [member] |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Proceeds from divesture/sale |  |  |  |  | $ 819 |
Dogger Bank Farm A and B [member] |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Ownership interest in joint venture |  | 40.00% | 40.00% |  |  |
Dogger Bank Farm A and B [member] | REN (member) |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Proportion of ownership interest divested |  | 10.00% | 10.00% |  |  |
Proceeds from divesture/sale |  | £ 206.4 | $ 285 |  |  |
Gain (loss ) on disposal of assets or discontinued operations |  | £ 202.8 | $ 280 |  |  |
Dogger Bank Farm A and B [member] | SSE Renewables [Member] |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Ownership interest in joint venture |  | 40.00% | 40.00% |  |  |
Dogger Bank Farm A and B [member] | Eni [Member] |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Ownership interest in joint venture |  | 20.00% | 20.00% |  |  |
Empire Wind and Beacon Wind assets on the US east coast [Member] |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Proportion of ownership interest divested |  |  |  | 50.00% |  |
Proceeds from divesture/sale |  |  |  | $ 1,200 |  |
Proportion of voting rights held in joint operation |  |  |  | 50.00% |  |
Prepaid |  |  |  |  |  | $ 500
Empire Wind and Beacon Wind assets on the US east coast [Member] | REN (member) |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Gain (loss ) on disposal of assets or discontinued operations |  |  |  | $ 1,100 |  |
Equinor Refining Denmark A/S (ERD) [member] |  |  |  |  |  |
Divestments [Line Items] |  |  |  |  |  |
Proportion of ownership interest held for sale | 100.00% |  |  |  |  |

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