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Financial assets and liabilities - Line of credit (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets and liabilities      
Total available credit lines $ 9,005,008 $ 6,721,139 $ 7,368,346
Available credit lines related to letters of credit 2,355,650 2,657,192 2,751,485
Available credit lines related to financial debt 6,649,358 4,063,947 4,616,861
Undrawn credit of financial debt 1,640,849    
Undrawn credit of letters of credit $ 86,066 $ 1,048,241 $ 1,739,775