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Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2022 $ 130,169 $ 125,330  
Cost 273,912 230,961 $ 216,407
Accumulated depreciation and impairment (120,488) (100,792) (91,077)
Additions 27,636 15,540  
Decommissioning costs - Additions to / review of estimates 2,672 3,269  
Capitalized borrowing costs 1,277 1,021  
Signature Bonuses Transfers (5) 16 1,177  
Write-offs               (631) (5,054)  
Transfers (6) 286 300  
Transfers to assets held for sale (279) (4,427)  
Depreciation, amortization and depletion (15,306) (14,618)  
Impairment recognition (note 26) (2,925) (1,453)  
Impairment reversal (note 26) 142 290  
Translation adjustment 10,367 8,794  
Balance at December 31, 2022 153,424 130,169  
Land Buildings And Improvement [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2022 2,538 2,383  
Cost 4,634 4,343 4,080
Accumulated depreciation and impairment (1,947) (1,805) (1,697)
Additions  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers (5)  
Write-offs               (11) (20)  
Transfers (6) 58 130  
Transfers to assets held for sale (16) (27)  
Depreciation, amortization and depletion (84) (88)  
Impairment recognition (note 26)  
Impairment reversal (note 26) 3  
Translation adjustment 199 160  
Balance at December 31, 2022 2,687 2,538  
Equipment And Other Assets [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2022 55,147 53,126  
Cost 118,173 105,429 98,085
Accumulated depreciation and impairment (59,764) (50,282) (44,959)
Additions 528 841  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers (5)  
Write-offs               (304) (746)  
Transfers (6) 5,531 5,162  
Transfers to assets held for sale (36) (1,874)  
Depreciation, amortization and depletion (5,079) (4,746)  
Impairment recognition (note 26) (1,689) (693)  
Impairment reversal (note 26) 101 223  
Translation adjustment 4,210 3,854  
Balance at December 31, 2022 58,409 55,147  
Assets Under Construction [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2022 14,838 16,922  
Cost 31,467 23,938 25,954
Accumulated depreciation and impairment (9,951) (9,100) (9,032)
Additions 11,919 7,525  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs 1,277 1,021  
Signature Bonuses Transfers (5)  
Write-offs               (86) (2,152)  
Transfers (6) (7,058) (8,611)  
Transfers to assets held for sale 99 (410)  
Depreciation, amortization and depletion  
Impairment recognition (note 26) (883) (605)  
Impairment reversal (note 26) 9 15  
Translation adjustment 1,401 1,133  
Balance at December 31, 2022 21,516 14,838  
Exploration And Development Costs [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2022 38,434 35,847  
Cost 74,809 67,581 61,906
Accumulated depreciation and impairment (34,377) (29,147) (26,059)
Additions 12 48  
Decommissioning costs - Additions to / review of estimates 2,672 3,269  
Capitalized borrowing costs  
Signature Bonuses Transfers (5) 16 1,177  
Write-offs               (74) (667)  
Transfers (6) 1,754 3,617  
Transfers to assets held for sale (241) (1,976)  
Depreciation, amortization and depletion (4,711) (5,306)  
Impairment recognition (note 26) (314) (142)  
Impairment reversal (note 26) 1 52  
Translation adjustment 2,883 2,515  
Balance at December 31, 2022 40,432 38,434  
Right-of-use assets [member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2022 19,212 17,052  
Cost 44,829 29,670 26,382
Accumulated depreciation and impairment (14,449) (10,458) $ (9,330)
Additions 15,177 7,126  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers (5)  
Write-offs               (156) (1,469)  
Transfers (6) 1 2  
Transfers to assets held for sale (85) (140)  
Depreciation, amortization and depletion (5,432) (4,478)  
Impairment recognition (note 26) (39) (13)  
Impairment reversal (note 26) 28  
Translation adjustment 1,674 1,132  
Balance at December 31, 2022 $ 30,380 $ 19,212