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Property, plant and equipment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2021 $ 130,169 $ 125,330    
Accumulated depreciation and impairment (115,049) (97,036) $ (100,792) $ (91,077)
Additions 12,188 6,915    
Decommissioning costs - Additions to / review of estimates 6 11    
Capitalized borrowing costs 583 530    
Signature Bonuses Transfers (5) 6 840    
Write-offs               (384) (3,689)    
Transfers (6) 781 87    
Transfers to assets held for sale (100) (3,469)    
Depreciation, amortization and depletion (7,145) (7,361)    
Impairment recognition (447) (108)    
Impairment reversal 43 25    
Translation adjustment 10,932 8,308    
Balance at June 30, 2022 146,632 127,419    
Right-of-use assets [member]        
IfrsStatementLineItems [Line Items]        
Accumulated depreciation and impairment (13,159) (10,265) (10,458) (9,330)
Gross carrying amount [member]        
IfrsStatementLineItems [Line Items]        
Cost 261,681 224,455 230,961 216,407
Accumulated depreciation and impairment (1,961) (1,765)    
Land Buildings And Improvement [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2021 2,538 2,383    
Cost 4,696 4,308 4,343 4,080
Accumulated depreciation and impairment     (1,805) (1,697)
Additions    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs    
Signature Bonuses Transfers (5)    
Write-offs                  
Transfers (6) 44 65    
Transfers to assets held for sale (16) (13)    
Depreciation, amortization and depletion (42) (44)    
Impairment recognition    
Impairment reversal 1    
Translation adjustment 210 152    
Balance at June 30, 2022 2,735 2,543    
Equipment And Other Assets [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2021 55,147 53,126    
Cost 115,136 102,174 105,429 98,085
Accumulated depreciation and impairment (56,825) (48,224) (50,282) (44,959)
Additions 229 442    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs    
Signature Bonuses Transfers (5)    
Write-offs               (181) (723)    
Transfers (6) 1,232 1,706    
Transfers to assets held for sale (52) (1,857)    
Depreciation, amortization and depletion (2,372) (2,369)    
Impairment recognition (180) (48)    
Impairment reversal 14 12    
Translation adjustment 4,474 3,661    
Balance at June 30, 2022 58,311 53,950    
Assets Under Construction [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2021 14,838 16,922    
Cost 29,432 25,582 23,938 25,954
Accumulated depreciation and impairment (9,539) (9,276) (9,100) (9,032)
Additions 4,653 3,209    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs 583 530    
Signature Bonuses Transfers (5)    
Write-offs               (17) (963)    
Transfers (6) (1,344) (4,095)    
Transfers to assets held for sale (7) (343)    
Depreciation, amortization and depletion    
Impairment recognition (266) (18)    
Impairment reversal 2    
Translation adjustment 1,453 1,062    
Balance at June 30, 2022 19,893 16,306    
Exploration And Development Costs [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2021 38,434 35,847    
Cost 73,661 64,420 67,581 61,906
Accumulated depreciation and impairment (33,565) (27,506) (29,147) (26,059)
Additions 2 9    
Decommissioning costs - Additions to / review of estimates 6 11    
Capitalized borrowing costs    
Signature Bonuses Transfers (5) 6 840    
Write-offs               (35) (614)    
Transfers (6) 848 2,411    
Transfers to assets held for sale (25) (1,248)    
Depreciation, amortization and depletion (2,207) (2,680)    
Impairment recognition (1) (42)    
Impairment reversal 11    
Translation adjustment 3,068 2,369    
Balance at June 30, 2022 40,096 36,914    
Right-of-use assets [member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2021 19,212 17,052    
Cost 38,756 27,971 $ 29,670 $ 26,382
Additions 7,304 3,255    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs    
Signature Bonuses Transfers (5)    
Write-offs               (151) (1,389)    
Transfers (6) 1    
Transfers to assets held for sale (8)    
Depreciation, amortization and depletion (2,524) (2,268)    
Impairment recognition    
Impairment reversal 28    
Translation adjustment 1,727 1,064    
Balance at June 30, 2022 $ 25,597 $ 17,706