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Property, plant and equipment -Impairments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized $ 4,093 $ (315)
The total net impairment losses recognised under IAS 36 4,043  
Acquisition costs related to oil and gas prospects [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 49 52
Goodwill [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 164  
Other intangible assets [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 41  
Producing and development assets [Member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 3,838 (367)
Property Plant And Equipment [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 3,230 (604)
Property Plant And Equipment [member] | Acquisition costs related to oil and gas prospects [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 0 0
Property Plant And Equipment [member] | Goodwill [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 0  
Property Plant And Equipment [member] | Other intangible assets [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 0  
Property Plant And Equipment [member] | Producing and development assets [Member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 3,230 (604)
Intangible assets [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 863 289
Intangible assets [member] | Acquisition costs related to oil and gas prospects [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 49 52
Intangible assets [member] | Goodwill [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 164  
Intangible assets [member] | Other intangible assets [member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized 41  
Intangible assets [member] | Producing and development assets [Member]    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Total net impairment loss/ (reversal) recognized $ 608 $ 237