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Cash and cash equivalents and other investments (Schedule of Cash and cash equivalents) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]        
Cash $ 898,394 $ 514,166    
Cash equivalents [1] 6,548,053 6,473,075    
Total cash and cash equivalents $ 7,446,447 $ 6,987,241 $ 7,203,604 $ 7,536,534
[1] Cash equivalents are investments with initial original maturities of less than 90 days and consist primarily of Treasury Bills issued by the United States Treasury Department.