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Segments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of operating segments [line items] |  |  |  |
Net impairment | $ (276) |  |  |
Net Impairment loss recognised as exploration expense | $ 113 |  |  |
Norway [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue | 76.00% | 79.00% | 78.00% | 80.00%
US [member} |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue | 16.00% | 16.00% | 16.00% | 15.00%
E&P International [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment |  |  | $ (93) |
E&P International [member] | South America [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net Impairment loss recognised as exploration expense |  |  | 95 |
E&P International [member] | Europe and Asia area [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment |  |  | (188) |
MMP [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment |  |  | 185 |
E&P Norway [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment |  |  | $ (396) |

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