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Intangibles (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2024
IfrsStatementLineItems [Line Items]      
Balance at beginning of year $ 11,631 $ 10,238  
Additions 53 183  
Disposals (9) 7  
Amortization (154) 144  
Translation adjustment (1,326) 731  
Balance at end of year 10,195 11,001  
Balance at end of year 10,195 11,001 $ 10,195
Disposals 9 (7)  
Amortization 154 (144)  
Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets and goodwill, cost 12,314 13,116  
Accumulated depreciation, amortisation and impairment [member]      
IfrsStatementLineItems [Line Items]      
Accumulated amortization (2,119) (2,115)  
Goodwill [member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of year 3,263 3,189  
Translation adjustment (252) 151  
Balance at end of year 3,011 3,340  
Balance at end of year 3,011 3,340  
Goodwill [member] | Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets and goodwill, cost 3,011 3,340  
Ifrs Concessions [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of year 7,689 6,434  
Additions 23 167  
Disposals (4) 7  
Amortization (125) 123  
Translation adjustment (989) 530  
Balance at end of year 6,594 7,001  
Balance at end of year 6,594 7,001  
Disposals 4 (7)  
Amortization 125 (123)  
Ifrs Concessions [Member] | Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets and goodwill, cost 8,200 8,601  
Ifrs Concessions [Member] | Accumulated depreciation, amortisation and impairment [member]      
IfrsStatementLineItems [Line Items]      
Accumulated amortization (1,606) (1,600)  
Computer software [member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of year 104 87  
Additions 30 13  
Amortization (29) 21  
Translation adjustment (12) 6  
Balance at end of year 93 85  
Balance at end of year 93 85  
Amortization 29 (21)  
Computer software [member] | Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets and goodwill, cost 606 600  
Computer software [member] | Accumulated depreciation, amortisation and impairment [member]      
IfrsStatementLineItems [Line Items]      
Accumulated amortization (513) (515)  
Research And Development Project And Patents [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of year 575 528  
Additions   3  
Disposals (5)    
Translation adjustment (73) 44  
Balance at end of year 497 575  
Balance at end of year 497 575  
Disposals 5    
Research And Development Project And Patents [Member] | Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets and goodwill, cost $ 497 $ 575