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Property, plant and equipment -Impairments (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised $ 2,827
Goodwill [member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 1
Acquisition costs related to oil and gas prospects [member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 170
Producing and development assets [Member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 2,656
Property Plant And Equipment [member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 2,379
Property Plant And Equipment [member] | Producing and development assets [Member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 2,379
Intangible assets [member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 448
Intangible assets [member] | Goodwill [member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised 1
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 losses (reversals) recognised 170
Intangible assets [member] | Producing and development assets [Member]  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Total net impairment losses (reversals) recognised $ 277