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Financial assets and liabilities - Line of credit (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial assets and liabilities      
Total available credit lines $ 6,721,139 $ 7,368,346 $ 6,936,237
Available credit lines related to financial debt 4,063,947 4,616,861 5,048,477
Available credit lines related to letters of credit 2,657,192 2,751,485 1,887,760
Undrawn credit $ 1,048,241 $ 1,739,775 $ 3,703,184