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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