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Other financial assets and liabilities - Liabilities related to the concession grant (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Other Provision, beginning $ 2,970  
Addition 82  
Present value adjustment 346  
Disbursements (114)  
Other Provision, Ending 3,284  
Current liabilities 611 $ 416
Non-current liabilities 2,673 2,554
Liabilities 3,284 2,970
Payment Obligation [Member]    
IfrsStatementLineItems [Line Items]    
Other Provision, beginning 954  
Addition 5  
Present value adjustment 131  
Disbursements (27)  
Other Provision, Ending 1,063  
Liabilities $ 1,063 $ 954
Discount rate 11.04% 11.04%
Infrastructure Investment [Member]    
IfrsStatementLineItems [Line Items]    
Other Provision, beginning $ 2,016  
Addition 77  
Present value adjustment 215  
Disbursements (87)  
Other Provision, Ending 2,221  
Liabilities $ 2,221 $ 2,016
Infrastructure Investment [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 5.10% 6.08%
Infrastructure Investment [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 5.57% 6.23%