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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