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Exploration and evaluation of oil and gas reserves (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property plant and equipment    
Balance at January 1, 2023 $ 153,424 $ 130,169
Additions 26,199 27,636
Balance at December 31, 2023 136,285 153,424
Intangible assets    
Opening Balance 3,042  
Transfers 7 (9)
Closing Balance 2,255 3,042
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs 3,084 3,825
Capitalised development expenditure [member]    
Intangible assets    
Opening Balance 2,313 2,406
Additions 20 147
Write-offs (19) (41)
Transfers (16)
Losses on exploration expenditures written off (224) (364)
Translation adjustment (481) 181
Closing Balance 1,609 2,313
Capitalized Acquistion Costs [Member]    
Property plant and equipment    
Balance at January 1, 2023 1,512 1,876
Additions 338 505
Write-offs (27) (8)
Transfers (3) (1,000)
Translation adjustment (345) 139
Balance at December 31, 2023 $ 1,475 $ 1,512