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Investments in Financial Instruments - Available-for-sale financial assets (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year $ 44,265,899  
Balance at the end of year 7,002,712 $ 44,265,899
Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund 5,511,412  
Open Ended Fund    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund 471,097  
Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund   (1,403,384)
Open Ended Fund    
Reconciliation for all assets and liabilities measured at fair value    
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund   (289,298)
FVOCIL    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 44,214,654 49,202,493
Disposition of investments (3,159,970) (2,404,508)
Change in fair value in other comprehensive income (1) (17,133,678) (2,583,331)
Warrants exercised for common stock of UHI (17,387,699)  
Balance at the end of year 6,533,307 44,214,654
FVOCIL | Warrants issued by UHI    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 33,775,451 34,921,530
Change in fair value in other comprehensive income (1) (16,387,752) (1,146,079)
Warrants exercised for common stock of UHI (17,387,699)  
Balance at the end of year   33,775,451
FVOCIL | Open Ended Fund    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 4,688,202 7,662,726
Disposition of investments (3,159,970) (2,331,785)
Change in fair value in other comprehensive income (1) (392,429) (642,739)
Balance at the end of year 1,135,803 4,688,202
FVOCIL | Other Equity Instruments    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year 5,751,001 6,545,625
Change in fair value in other comprehensive income (1) (353,497) (794,624)
Balance at the end of year $ 5,397,504 5,751,001
FVOCIL | Other Financial Assets    
Reconciliation for all assets and liabilities measured at fair value    
Balance at beginning of year   72,612
Disposition of investments   (72,723)
Change in fair value in other comprehensive income (1)   $ 111