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Intangible assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2023 $ 2,255 $ 3,042    
Cost   3,927 $ 3,433 $ 4,405
Accumulated amortization and impairment   (1,239) (1,178) (1,363)
Addition 113 102    
Capitalized borrowing costs 5 4    
Write-offs (1)      
Transfers 2 4    
Amortization (72) (67)    
Impairment recognition (note 19) (165)      
Translation adjustment 295 (397)    
Balance at June 30, 2024 2,432 2,688    
Service concession rights [member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2023 1,697 2,425    
Cost 1,973 2,169 1,750 2,489
Accumulated amortization and impairment (217) (57) (53) (64)
Addition 7 1    
Capitalized borrowing costs    
Write-offs      
Transfers    
Amortization (2) (2)    
Impairment recognition (note 19) (165)      
Translation adjustment 219 (312)    
Balance at June 30, 2024 $ 1,756 $ 2,112    
Estimated useful life in years 2 years 2 years    
Software Licenses [Member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2023 $ 538 $ 592    
Cost   1,736 1,663 1,891
Accumulated amortization and impairment   (1,182) (1,125) (1,299)
Addition 106 101    
Capitalized borrowing costs 5 4    
Write-offs (1)      
Transfers 2 4    
Amortization (70) (65)    
Impairment recognition (note 19)      
Translation adjustment 73 (82)    
Balance at June 30, 2024 $ 653 $ 554    
Estimated useful life in years 5 years 5 years    
Goodwill [member]        
IfrsStatementLineItems [Line Items]        
Balance at December 31, 2023 $ 20 $ 25    
Cost   22 $ 20 $ 25
Addition    
Capitalized borrowing costs    
Write-offs      
Transfers    
Amortization    
Impairment recognition (note 19)      
Translation adjustment 3 (3)    
Balance at June 30, 2024 $ 23 $ 22