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Other financial assets and liabilities - Liabilities related to the concession grant (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 28, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
item
project
km
Ifrs Statement [Line Items]      
Extension term for concessions   30 years  
Liabilities related to the concession grant   $ 2,312 $ 2,196
Prepayment of part of concession agreements $ 367    
Financial guarantee coverage     $ 180
Concessions grants      
Ifrs Statement [Line Items]      
Extension term for concessions     30 years
Liabilities related to the concession grant   $ 542 $ 586
Discount rate   11.04% 11.04%
Midwest Integration Railway ("FICO")      
Ifrs Statement [Line Items]      
Liabilities related to the concession grant   $ 1,306 $ 1,206
Discount rate   2.59% 5.11%
Area to Be Constructed | km     383
Construction Period     6 years
Infrastructure program      
Ifrs Statement [Line Items]      
Liabilities related to the concession grant   $ 264 $ 342
Discount rate   3.08% 5.22%
Number of separate projects designed to improve safety and reduce trespass | project     450
Infrastructure program | Maximum      
Ifrs Statement [Line Items]      
Number of municipalities that will be benefited by program | item     33
Infrastructure program | Minimum      
Ifrs Statement [Line Items]      
Number of municipalities that will be benefited by program | item     25
West-East Integration Railway ("FIOL")      
Ifrs Statement [Line Items]      
Liabilities related to the concession grant   $ 200 $ 62
Discount rate   2.67% 5.75%