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Financial assets and liabilities - Line of credit (Details) - MXN ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets and liabilities    
Total available credit lines $ 9,949,640 $ 9,256,978
Available credit lines related to letters of credit 2,982,110 2,405,640
Available credit lines related to financial debt 6,967,530 6,851,338
Undrawn credit of financial debt   1,500,726
Undrawn credit of letters of credit $ 476,689 $ 214,012