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Segments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of operating segments [line items] |  |  |  |
Net impairment | $ 374 |  |  |
Net Impairment loss recognissed as exploaration expense | $ 111 |  |  |
Norway [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue | 79.00% | 72.00% | 80.00% | 74.00%
US [member} |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue | 16.00% | 22.00% | 15.00% | 19.00%
E&P International [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment | $ 146 |  |  |
Net Impairment loss recognissed as exploaration expense | 111 |  |  |
E&P International [member] | North America [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment | 35 |  |  |
MMP [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Inventory write-down |  |  | $ 605 |
MMP [member] | Norway [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net impairment | 228 |  |  |
New Energy Solutions (NES) [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net income (loss) from equity accounted investments | $ 38 | $ 10 | $ 82 | $ 53

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