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Property, plant and equipment -impairment (narrative) (Details) - USD ($)
 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]    
Total net impairment loss/ (reversal) recognized $ 4,093,000,000 $ (315,000,000)
Net impairment loss 4,043,000,000  
Increased refinery margin forecast [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment reversals   155,000,000
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]    
Impairment reversals   246,000,000
Net impairment loss 292,000,000  
North America [member] | Unconventional assets [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Net impairment loss 2,241,000,000 762,000,000
North America [member] | Unconventional assets [Member] | Exploration and evaluation assets [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Net impairment loss 608,000,000 237,000,000
North Africa [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total net impairment loss/ (reversal) recognized 0  
Impairment reversals   126,000,000
Exploration & Production Norway (E&P) [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment reversals   $ 604,000,000
Net impairment loss 1,119,000,000  
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 reversals 178,000,000  
Net impairment loss $ 178,000,000