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Investments in Financial Instruments (Details) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Instruments      
Non-current financial assets $ 43,996,852 $ 45,136,751  
Held-to-maturity investments      
Financial Instruments      
Non-current financial assets 287,605 335,833  
Other Financial Assets      
Financial Instruments      
Non-current financial assets 16,487 45,920  
Available-for-sale financial assets      
Financial Instruments      
Non-current financial assets 43,692,760 44,754,998 $ 40,915,820
Available-for-sale financial assets | Warrants issued by UHI      
Financial Instruments      
Non-current financial assets 36,395,183 38,298,606 35,042,577
Available-for-sale financial assets | Available-for-sale investments      
Financial Instruments      
Non-current financial assets $ 7,297,577 $ 6,456,392 $ 5,873,243