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Investments in Financial Instruments -Available-for-sale financial assets (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year $ 49,203,430  
Balance at the end of year 44,265,899 $ 49,203,430
Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange (loss) gain derived from the hedge Open Ended Fund (1,403,384) 125,955
Open Ended Fund    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange (loss) gain derived from the hedge Open Ended Fund (289,298) (317,126)
FVOCIL    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 49,202,493 49,635,260
Investments   72,723
Disposition of investments (2,404,508) (168,575)
Change in fair value in other comprehensive income (1) (2,583,331) (336,915)
Balance at the end of year 44,214,654 49,202,493
FVOCIL | Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 34,921,530 36,395,183
Change in fair value in other comprehensive income (1) (1,146,079) (1,473,653)
Balance at the end of year 33,775,451 34,921,530
FVOCIL | Open Ended Fund    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 7,662,726 7,297,577
Disposition of investments (2,331,785) (167,934)
Change in fair value in other comprehensive income (1) (642,739) 533,083
Balance at the end of year 4,688,202 7,662,726
FVOCIL | Other Equity Instruments    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 6,545,625 5,942,500
Disposition of investments   (641)
Change in fair value in other comprehensive income (1) (794,624) 603,766
Balance at the end of year 5,751,001 6,545,625
FVOCIL | Other Financial Assets    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 72,612  
Investments   72,723
Disposition of investments (72,723)  
Change in fair value in other comprehensive income (1) $ 111 (111)
Balance at the end of year   $ 72,612