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Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2023 $ 153,424 $ 130,169  
Cost 240,902 273,912 $ 230,961
Accumulated depreciation and impairment (104,617) (120,488) (100,792)
Additions 26,199 27,636  
Decommissioning costs - Additions to / review of estimates 6,393 2,672  
Capitalized borrowing costs 1,558 1,277  
Signature Bonuses Transfers (6)   16  
Write-offs (436) (631)  
Transfers (5) 569 286  
Transfers to assets held for sale (318) (279)  
Depreciation, amortization and depletion (14,953) (15,306)  
Impairment recognition (note 25) (1,674) (2,925)  
Impairment reversal (note 25) 187 142  
Translation adjustment (34,664) 10,367  
Balance at December 31, 2023 136,285 153,424  
Land Buildings And Improvement [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2023 2,687 2,538  
Cost 3,895 4,634 4,343
Accumulated depreciation and impairment (1,410) (1,947) (1,805)
Additions 21  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers (6)    
Write-offs (8) (11)  
Transfers (5) 482 58  
Transfers to assets held for sale (16)  
Depreciation, amortization and depletion (78) (84)  
Impairment recognition (note 25) (2)  
Impairment reversal (note 25) 4 3  
Translation adjustment (621) 199  
Balance at December 31, 2023 2,485 2,687  
Equipment And Other Assets [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2023 58,409 55,147  
Cost 96,963 118,173 105,429
Accumulated depreciation and impairment (51,156) (59,764) (50,282)
Additions 381 528  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers (6)    
Write-offs (53) (304)  
Transfers (5) 5,126 5,531  
Transfers to assets held for sale 20 (36)  
Depreciation, amortization and depletion (4,963) (5,079)  
Impairment recognition (note 25) (439) (1,689)  
Impairment reversal (note 25) 140 101  
Translation adjustment (12,814) 4,210  
Balance at December 31, 2023 45,807 58,409  
Assets Under Construction [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2023 21,516 14,838  
Cost 30,321 31,467 23,938
Accumulated depreciation and impairment (5,937) (9,951) (9,100)
Additions 15,203 11,919  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs 1,558 1,277  
Signature Bonuses Transfers (6)    
Write-offs (300) (86)  
Transfers (5) (7,641) (7,058)  
Transfers to assets held for sale (5) 99  
Depreciation, amortization and depletion  
Impairment recognition (note 25) (324) (883)  
Impairment reversal (note 25) 11 9  
Translation adjustment (5,634) 1,401  
Balance at December 31, 2023 24,384 21,516  
Exploration And Development Costs [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2023 40,432 38,434  
Cost 67,357 74,809 67,581
Accumulated depreciation and impairment (31,436) (34,377) (29,147)
Additions 102 12  
Decommissioning costs - Additions to / review of estimates 6,393 2,672  
Capitalized borrowing costs  
Signature Bonuses Transfers (6)   16  
Write-offs (9) (74)  
Transfers (5) 2,592 1,754  
Transfers to assets held for sale (402) (241)  
Depreciation, amortization and depletion (3,699) (4,711)  
Impairment recognition (note 25) (864) (314)  
Impairment reversal (note 25) 19 1  
Translation adjustment (8,643) 2,883  
Balance at December 31, 2023 35,921 40,432  
Right-of-use assets [member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2023 30,380 19,212  
Cost 42,366 44,829 29,670
Accumulated depreciation and impairment (14,678) (14,449) $ (10,458)
Additions 10,492 15,177  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers (6)    
Write-offs (66) (156)  
Transfers (5) 10 1  
Transfers to assets held for sale 69 (85)  
Depreciation, amortization and depletion (6,213) (5,432)  
Impairment recognition (note 25) (45) (39)  
Impairment reversal (note 25) 13 28  
Translation adjustment (6,952) 1,674  
Balance at December 31, 2023 $ 27,688 $ 30,380