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Property, plant and equipment -impairment (narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | 168 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Net impairment loss | $ 7,057 | $ 4,093 | $ (315) |
Impairment loss | 6,401 | 4,043 |  |
Exploration expenses | 3,483 | 1,854 | $ 1,405 |
Exploration and Production Norway [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss | 1,219 | 1,119 |  |
Exploration And Production USA [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss |  |  |  | $ 16,500
Exploration And Production USA [Member] | Exploration and evaluation assets [member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss |  |  |  | 1,300
Exploration And Production USA [Member] | Goodwill [member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss |  |  |  | $ 1,200
Exploration And Production USA [Member] | Onshore [member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Net impairment loss | 2,313 |  |  |
Impairment reversals | 234 |  |  |
Impairment loss | 2,547 | 2,241 |  |
Exploration expenses | 680 | 608 |  |
Exploration And Production USA [Member] | Onshore [member] | Price assumptions and change to fair value less cost of disposal valuation [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Exploration expenses | 743 |  |  |
Exploration And Production USA [Member] | Offshore Gulf of Mexico [member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Net impairment loss |  | 292 |  |
Impairment loss | 305 |  |  |
Marketing, Midstream and Processing (MMP) [member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss | 1,052 | $ 178 |  |
Exploration and Production International [Member] | North America offshore other areas [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss | 146 |  |  |
Exploration and Production International [Member] | Europe and Asia [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment loss | $ 1,280 |  |  |

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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2019-en-r&anchor=para_24_b&doctype=Standard -URIDate 2019-03-27 + Details
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