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Property, plant and equipment -impairment (narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended 168 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Net impairment loss $ 7,057 $ 4,093 $ (315)  
Impairment loss 6,401 4,043    
Exploration expenses 3,483 1,854 $ 1,405  
Exploration and Production Norway [Member]        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Impairment loss 1,219 1,119    
Exploration And Production USA [Member]        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Impairment loss       $ 16,500
Exploration And Production USA [Member] | Exploration and evaluation assets [member]        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Impairment loss       1,300
Exploration And Production USA [Member] | Goodwill [member]        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Impairment loss       $ 1,200
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]        
Net impairment loss 2,313      
Impairment reversals 234      
Impairment loss 2,547 2,241    
Exploration expenses 680 608    
Exploration And Production 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      
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]        
Net impairment loss   292    
Impairment loss 305      
Marketing, Midstream and Processing (MMP) [member]        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Impairment loss 1,052 $ 178    
Exploration and Production 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 loss 146      
Exploration and Production International [Member] | Europe and Asia [Member]        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Impairment loss $ 1,280