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Cash and Cash Equivalents and Temporary Investments - Cash and Cash equivalents (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents and Temporary Investments        
Cash and bank accounts $ 1,758,262 $ 1,961,106    
Short-term investments 25,693,735 30,107,185    
Total cash and cash equivalents $ 27,451,997 $ 32,068,291 $ 38,734,949 $ 47,546,083