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Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2021 $ 125,330 $ 124,201  
Accumulated depreciation and impairment (100,792) (91,077) $ (100,674)
Additions 15,540 14,370  
Decommissioning costs - Additions to / review of estimates 3,269 (1,069)  
Capitalized borrowing costs 1,021 971  
Signature Bonuses Transfers 1,177 11,629  
Write-offs               (5,054) (3,149)  
Transfers 300 1,263  
Transfers to assets held for sale (4,427) (4,240)  
Depreciation, amortization and depletion (14,618) (12,955)  
Impairment recognition (1,453) (409)  
Impairment reversal 290 3,823  
Translation adjustment 8,794 (9,105)  
Balance at December 31, 2021 130,169 125,330  
Right-of-use assets [member]      
IfrsStatementLineItems [Line Items]      
Accumulated depreciation and impairment (10,458) (9,330) (7,911)
Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Cost 230,961 216,407 224,875
Land Buildings And Improvement [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2021 2,383 3,043  
Cost 4,343 4,080 5,450
Accumulated depreciation and impairment (1,805) (1,697) (2,407)
Additions  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers  
Write-offs               (20) (38)  
Transfers 130 (295)  
Transfers to assets held for sale (27) (53)  
Depreciation, amortization and depletion (88) (97)  
Impairment recognition  
Impairment reversal  
Translation adjustment 160 (177)  
Balance at December 31, 2021 2,538 2,383  
Equipment And Other Assets [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2021 53,126 58,680  
Cost 105,429 98,085 107,199
Accumulated depreciation and impairment (50,282) (44,959) (48,519)
Additions 841 1,650  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers  
Write-offs               (746) (588)  
Transfers 5,162 2,934  
Transfers to assets held for sale (1,874) (2,776)  
Depreciation, amortization and depletion (4,746) (4,235)  
Impairment recognition (693) (377)  
Impairment reversal 223 1,796  
Translation adjustment 3,854 (3,958)  
Balance at December 31, 2021 55,147 53,126  
Assets Under Construction [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2021 16,922 15,443  
Cost 23,938 25,954 27,544
Accumulated depreciation and impairment (9,100) (9,032) (12,101)
Additions 7,525 5,761  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs 1,021 971  
Signature Bonuses Transfers  
Write-offs               (2,152) (599)  
Transfers (8,611) (3,160)  
Transfers to assets held for sale (410) (575)  
Depreciation, amortization and depletion  
Impairment recognition (605) (1)  
Impairment reversal 15 114  
Translation adjustment 1,133 (1,032)  
Balance at December 31, 2021 14,838 16,922  
Exploration And Development Costs [Member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2021 35,847 31,166  
Cost 67,581 61,906 60,902
Accumulated depreciation and impairment (29,147) (26,059) (29,736)
Additions 48 5  
Decommissioning costs - Additions to / review of estimates 3,269 (1,069)  
Capitalized borrowing costs  
Signature Bonuses Transfers 1,177 11,629  
Write-offs               (667) (1,645)  
Transfers 3,617 1,781  
Transfers to assets held for sale (1,976) (822)  
Depreciation, amortization and depletion (5,306) (4,342)  
Impairment recognition (142) (27)  
Impairment reversal 52 1,879  
Translation adjustment 2,515 (2,708)  
Balance at December 31, 2021 38,434 35,847  
Right-of-use assets [member]      
IfrsStatementLineItems [Line Items]      
Balance at January 1, 2021 17,052 15,869  
Cost 29,670 26,382 $ 23,780
Additions 7,126 6,954  
Decommissioning costs - Additions to / review of estimates  
Capitalized borrowing costs  
Signature Bonuses Transfers  
Write-offs               (1,469) (279)  
Transfers 2 3  
Transfers to assets held for sale (140) (14)  
Depreciation, amortization and depletion (4,478) (4,281)  
Impairment recognition (13) (4)  
Impairment reversal 34  
Translation adjustment 1,132 (1,230)  
Balance at December 31, 2021 $ 19,212 $ 17,052