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Property, plant and equipment -Impairments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized $ 1,439 $ 7,057 $ 4,093
The total net impairment losses recognised under IAS 36 1,285 6,401  
Goodwill [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 1 42 164
Other intangible assets [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 0 8 41
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 154 657 49
Producing and development assets [Member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 1,283 6,351 3,838
Property Plant And Equipment [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 1,285 5,671 3,230
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 1,285 5,671 3,230
Intangible assets [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 154 1,386 863
Intangible assets [member] | Goodwill [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 1 42 164
Intangible assets [member] | Other intangible assets [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Total net impairment loss/ (reversal) recognized 0 8 41
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 154 657 49
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 $ (2) $ 680 $ 608