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Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Derivative financial instruments |  |  |
Financial Instruments |  |  |
Assets at fair value |  | $ 4,592 |
Open Ended Fund |  |  |
Financial Instruments |  |  |
Assets at fair value | $ 1,135,803 | 4,688,202 |
Other Equity Instruments |  |  |
Financial Instruments |  |  |
Assets at fair value | 5,397,504 | 5,751,001 |
Warrants issued by UHI |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 33,775,451 |
Recurring basis |  |  |
Financial Instruments |  |  |
Assets at fair value | 6,533,307 | 44,219,246 |
Liabilities at fair value | 3,476,223 |  |
Recurring basis | Derivative financial instruments |  |  |
Financial Instruments |  |  |
Liabilities at fair value | 3,476,223 |  |
Recurring basis | FVOCIL |  |  |
Financial Instruments |  |  |
Liabilities at fair value |  | 915,290 |
Recurring basis | Open Ended Fund | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value | 1,135,803 | 4,688,202 |
Recurring basis | Other Equity Instruments | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value | 5,397,504 | 5,751,001 |
Recurring basis | Derivative financial instruments | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 4,592 |
Liabilities at fair value |  | 915,290 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Financial Instruments |  |  |
Assets at fair value | 5,397,504 | 5,751,001 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Other Equity Instruments | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value | 5,397,504 | 5,751,001 |
Internal Models with Significant Observable Inputs (Level 2) | Recurring basis |  |  |
Financial Instruments |  |  |
Assets at fair value | 1,135,803 | 4,692,794 |
Liabilities at fair value | 3,476,223 |  |
Internal Models with Significant Observable Inputs (Level 2) | Recurring basis | Derivative financial instruments |  |  |
Financial Instruments |  |  |
Liabilities at fair value | 3,476,223 |  |
Internal Models with Significant Observable Inputs (Level 2) | Recurring basis | FVOCIL |  |  |
Financial Instruments |  |  |
Liabilities at fair value |  | 915,290 |
Internal Models with Significant Observable Inputs (Level 2) | Recurring basis | Open Ended Fund | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value | $ 1,135,803 | 4,688,202 |
Internal Models with Significant Observable Inputs (Level 2) | Recurring basis | Derivative financial instruments | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 4,592 |
Liabilities at fair value |  | 915,290 |
Internal Models with Significant Unobservable Inputs (Level 3) |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 33,775,451 | $ 34,921,530
Internal Models with Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 33,775,451 |
UHI | Warrants issued by UHI |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 33,775,451 |
UHI | Recurring basis | Warrants issued by UHI | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value |  | 33,775,451 |
UHI | Internal Models with Significant Unobservable Inputs (Level 3) | Recurring basis | Warrants issued by UHI | FVOCIL |  |  |
Financial Instruments |  |  |
Assets at fair value |  | $ 33,775,451 |

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