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Cash and cash equivalents and other investments (Schedule of Cash and cash equivalents) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents [abstract]        
Cash $ 514,166 $ 1,339,887    
Cash equivalents [1] 6,473,075 5,863,717    
Total cash and cash equivalents $ 6,987,241 $ 7,203,604 $ 7,536,534 $ 6,224,502
[1] Most of these cash equivalents correspond to Treasury Bills issued by the United States Treasury Department, whose initial original maturity is less than 90 days.