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Investments in Financial Instruments -Available-for-sale financial assets (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year $ 45,136,751  
Balance at the end of year 43,996,852 $ 45,136,751
Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI (1,622,976) 6,891,428
Open Ended Fund    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI (167,490) 615,528
Available-for-sale financial assets    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 44,754,998 40,915,820
Change in fair value in other comprehensive income (1) (1,062,238) 3,839,178
Balance at the end of year 43,692,760 44,754,998
Available-for-sale financial assets | Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 38,298,606 35,042,577
Change in fair value in other comprehensive income (1) (1,903,423) 3,256,029
Balance at the end of year 36,395,183 38,298,606
Available-for-sale financial assets | Available-for-sale investments    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 6,456,392 5,873,243
Change in fair value in other comprehensive income (1) 841,185 583,149
Balance at the end of year $ 7,297,577 $ 6,456,392