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Property, plant and equipment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2022 $ 153,424 $ 130,169    
Cost 245,764 261,681 $ 273,912 $ 230,961
Accumulated depreciation and impairment (109,813) (115,049) (120,488) (100,792)
Additions 9,375 12,188    
Decommissioning costs - Additions to / review of estimates 66 6    
Capitalized borrowing costs 755 583    
Signature Bonuses Transfers (6)   6    
Write-offs               (175) (384)    
Transfers (5) 206 781    
Transfers to assets held for sale (135) (100)    
Depreciation, amortization and depletion (7,639) (7,145)    
Impairment recognition (note 19)   (447)    
Impairment reversal (note 19) 50 43    
Translation adjustment (19,976) 10,932    
Balance at June 30, 2023 135,951 146,632    
Land Buildings And Improvement [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2022 2,687 2,538    
Cost 3,927 4,696 4,634 4,343
Accumulated depreciation and impairment (1,657) (1,961) (1,947) (1,805)
Additions    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs    
Signature Bonuses Transfers (6)      
Write-offs               (3)    
Transfers (5) (40) 44    
Transfers to assets held for sale (16)    
Depreciation, amortization and depletion (38) (42)    
Impairment recognition (note 19)      
Impairment reversal (note 19) 3 1    
Translation adjustment (339) 210    
Balance at June 30, 2023 2,270 2,735    
Equipment And Other Assets [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2022 58,409 55,147    
Cost 103,923 115,136 118,173 105,429
Accumulated depreciation and impairment (53,678) (56,825) (59,764) (50,282)
Additions 188 229    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs    
Signature Bonuses Transfers (6)      
Write-offs               (14) (181)    
Transfers (5) 1,668 1,232    
Transfers to assets held for sale (21) (52)    
Depreciation, amortization and depletion (2,554) (2,372)    
Impairment recognition (note 19)   (180)    
Impairment reversal (note 19) 32 14    
Translation adjustment (7,463) 4,474    
Balance at June 30, 2023 50,245 58,311    
Assets Under Construction [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2022 21,516 14,838    
Cost 31,292 29,432 31,467 23,938
Accumulated depreciation and impairment (8,670) (9,539) (9,951) (9,100)
Additions 6,096 4,653    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs 755 583    
Signature Bonuses Transfers (6)      
Write-offs               (128) (17)    
Transfers (5) (2,459) (1,344)    
Transfers to assets held for sale (5) (7)    
Depreciation, amortization and depletion    
Impairment recognition (note 19)   (266)    
Impairment reversal (note 19) 2    
Translation adjustment (3,155) 1,453    
Balance at June 30, 2023 22,622 19,893    
Exploration And Development Costs [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2022 40,432 38,434    
Cost 66,123 73,661 74,809 67,581
Accumulated depreciation and impairment (31,731) (33,565) (34,377) (29,147)
Additions 32 2    
Decommissioning costs - Additions to / review of estimates 66 6    
Capitalized borrowing costs    
Signature Bonuses Transfers (6)   6    
Write-offs               (5) (35)    
Transfers (5) 1,054 848    
Transfers to assets held for sale (109) (25)    
Depreciation, amortization and depletion (1,979) (2,207)    
Impairment recognition (note 19)   (1)    
Impairment reversal (note 19)    
Translation adjustment (5,099) 3,068    
Balance at June 30, 2023 34,392 40,096    
Right-of-use assets [member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2022 30,380 19,212    
Cost 40,499 38,756 44,829 29,670
Accumulated depreciation and impairment (14,077) (13,159) $ (14,449) $ (10,458)
Additions 3,059 7,304    
Decommissioning costs - Additions to / review of estimates    
Capitalized borrowing costs    
Signature Bonuses Transfers (6)      
Write-offs               (25) (151)    
Transfers (5) (17) 1    
Transfers to assets held for sale    
Depreciation, amortization and depletion (3,068) (2,524)    
Impairment recognition (note 19)      
Impairment reversal (note 19) 13 28    
Translation adjustment (3,920) 1,727    
Balance at June 30, 2023 $ 26,422 $ 25,597