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Property, plant and equipment -impairment (narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Net impairment loss $ 1,439 $ 7,057 $ 4,093
Impairment reversals 1,102    
Impairment loss 1,285 6,401  
Exploration expenses 1,004 3,483 $ 1,854
E&P- Norway [member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Impairment loss   1,219  
E&P 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 reversals 22    
Impairment loss   146  
E&P International [member] | Europe and Asia [Member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Net impairment loss 1,609    
Impairment loss   1,280  
E&P International [member] | Europe and Asia [Member] | Downward reserve revision [member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Net impairment loss 1,786    
E&P International [member] | Europe and Asia [Member] | Higher prices [member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Net impairment loss 177    
E&P 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 48 2,313  
Impairment reversals 60 234  
Impairment loss 108 2,547  
Exploration expenses 2 680  
E&P 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  
E&P USA [member] | Onshore [member] | Downward reserve revision [member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Exploration expenses 20    
E&P USA [member] | Onshore [member] | Upward reserve revision [member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Exploration expenses 22    
E&P 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]      
Impairment loss 18 305  
MMP [member]      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Impairment loss $ 716 $ 1,052