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Financial Instruments - Significant Unobservable Inputs (Details) - Internal Models with Significant Unobservable Inputs (Level 3) - 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 $ 33,775,451 $ 34,921,530
Included in other comprehensive income (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