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Exploration and evaluation of oil and gas reserves (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property plant and equipment    
Balance at January 1, 2022 $ 130,169 $ 125,330
Additions 27,636 15,540
Balance at December 31, 2022 153,424 130,169
Intangible assets    
Opening Balance 2,986  
Transfers (9) (12)
Closing Balance 3,042 2,986
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs 3,825 4,282
Capitalised development expenditure [member]    
Intangible assets    
Opening Balance 2,406 2,576
Additions 147 840
Write-offs (41)
Transfers (16) (1,187)
Losses on exploration expenditures written off (364)
Translation adjustment 181 177
Closing Balance 2,313 2,406
Capitalized Acquistion Costs [Member]    
Property plant and equipment    
Balance at January 1, 2022 1,876 1,994
Additions 505 379
Write-offs (8) (545)
Transfers (1,000) (83)
Translation adjustment 139 131
Balance at December 31, 2022 $ 1,512 $ 1,876