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Property, plant and equipment -impairment of carrying amount of impaired asset (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Base discount rate for VIU calculations, net of tax | 5.00% | 6.00%
Carrying amount after impairment | $ 21,619 | $ 13,704
Net impairement loss (Reversal) | $ 6,351 | 3,838
Exploration and Production Norway [Member] | High range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 15.00% |
Exploration and Production Norway [Member] | Low range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 8.00% |
Exploration and Production International [Member] | High range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 10.00% |
Exploration and Production International [Member] | Low range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 5.00% |
Exploration And Production USA [Member] | High range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 7.00% |
Exploration And Production USA [Member] | Low range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 6.00% |
Marketing, Midstream and Processing (MMP) [member] | High range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 11.00% |
Marketing, Midstream and Processing (MMP) [member] | Low range value [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Derived pretax Discount rate range | 6.00% |
VIU [Member] | Right of use assets [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | $ 265 | 0
Net impairement loss (Reversal) | 36 | 26
VIU [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] |  |
Carrying amount after impairment | 53 | 0
Net impairement loss (Reversal) | 146 | 0
VIU [Member] | Europe and Asia [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 3,687 | 645
Net impairement loss (Reversal) | 1,280 | (18)
VIU [Member] | Exploration and Production Norway [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 7,042 | 4,406
Net impairement loss (Reversal) | 1,219 | 1,119
VIU [Member] | 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] |  |
Carrying amount after impairment | 4,676 | 7,509
Net impairement loss (Reversal) | (19) | 1,631
VIU [Member] | 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] |  |
Carrying amount after impairment | 2,808 | 1,079
Net impairement loss (Reversal) | 305 | 292
VIU [Member] | Marketing, Midstream and Processing (MMP) [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 1,297 | 65
Net impairement loss (Reversal) | 824 | 178
FVLCOD [Member] | 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] |  |
Carrying amount after impairment | 1,122 | 0
Net impairement loss (Reversal) | 2,331 | 610
FVLCOD [Member] | Marketing, Midstream and Processing (MMP) [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 668 | 0
Net impairement loss (Reversal) | $ 228 | $ 0

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