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Property, plant and equipment -impairment of carrying amount of impaired asset (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
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 | 6.00% |
Carrying amount after impairment | $ 13,704 | $ 13,813
Net impairement loss (Reversal) | 3,838 | (367)
Exploration & Production Norway (E&P) [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Net impairement loss (Reversal) | $ 604 |
Exploration & Production Norway (E&P) [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 | 25.00% |
Exploration & Production Norway (E&P) [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 | 15.00% |
Exploration Production International And Marketing Midstream and Processing [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 | 9.00% |
Exploration Production International And Marketing Midstream and Processing [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 | 4.00% |
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 | $ 0 | 0
Net impairement loss (Reversal) | 26 | 0
VIU [Member] | North Africa [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 0 | 451
Net impairement loss (Reversal) | 0 | (126)
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 | 645 | 0
Net impairement loss (Reversal) | (18) | 0
VIU [Member] | North America, offshore Gulf of Mexico [Member] | Conventional assets [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 1,079 | 3,989
Net impairement loss (Reversal) | 292 | (246)
VIU [Member] | North America [member] | Unconventional assets [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 7,509 | 5,771
Net impairement loss (Reversal) | 1,631 | 762
VIU [Member] | Exploration & Production Norway (E&P) [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 4,406 | 1,966
Net impairement loss (Reversal) | 1,119 | (201)
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 | 65 | 403
Net impairement loss (Reversal) | 178 | (155)
FVLCOD [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 | 0 | 0
Net impairement loss (Reversal) | 0 | 0
FVLCOD [Member] | North Africa [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 0 | 0
Net impairement loss (Reversal) | 0 | 0
FVLCOD [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 | 0 | 0
Net impairement loss (Reversal) | 0 | 0
FVLCOD [Member] | North America, offshore Gulf of Mexico [Member] | Conventional assets [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 0 | 0
Net impairement loss (Reversal) | 0 | 0
FVLCOD [Member] | North America [member] | Unconventional assets [Member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 0 | 0
Net impairement loss (Reversal) | 610 | 0
FVLCOD [Member] | Exploration & Production Norway (E&P) [member] |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Carrying amount after impairment | 0 | 1,232
Net impairement loss (Reversal) | 0 | (402)
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 | 0 | 0
Net impairement loss (Reversal) | $ 0 | $ 0

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