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Property, plant and equipment -impairment (narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Net impairment loss | $ 1,439 | $ 7,057 | $ 4,093
Impairment reversals | 1,102 |  |
Impairment loss | 1,285 | 6,401 |
Exploration expenses | 1,004 | 3,483 | $ 1,854
E&P- Norway [member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Impairment loss |  | 1,219 |
E&P 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 reversals | 22 |  |
Impairment loss |  | 146 |
E&P International [member] | Europe and Asia [Member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Net impairment loss | 1,609 |  |
Impairment loss |  | 1,280 |
E&P International [member] | Europe and Asia [Member] | Downward reserve revision [member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Net impairment loss | 1,786 |  |
E&P International [member] | Europe and Asia [Member] | Higher prices [member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Net impairment loss | 177 |  |
E&P 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 | 48 | 2,313 |
Impairment reversals | 60 | 234 |
Impairment loss | 108 | 2,547 |
Exploration expenses | 2 | 680 |
E&P 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 |
E&P USA [member] | Onshore [member] | Downward reserve revision [member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Exploration expenses | 20 |  |
E&P USA [member] | Onshore [member] | Upward reserve revision [member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Exploration expenses | 22 |  |
E&P 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] |  |  |
Impairment loss | 18 | 305 |
MMP [member] |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Impairment loss | $ 716 | $ 1,052 |

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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 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard -URIDate 2021-03-24 + Details
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