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Investments in Financial Instruments - Available-for-sale financial assets (Details) - MXN ($) $ in Thousands | 12 Months Ended
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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

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