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Financial Instruments - Class of Assets and Liabilities Subject to Recurring Fair Value Measurements Categorized Within Level 3 (Details) - MXN ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Financial Instruments |  |
Potential Impact on Consolidated Equity Statement, Most Favourable Assumption | $ 3,377,623 | $ 3,492,229
Potential Impact on Consolidated Equity Statement, Least Favourable Assumption | $ (3,377,623) | $ (3,492,229)
Non-recurring basis |  |
Financial Instruments |  |
Expected future cash flow time period | 5 years |
UHI | Recurring basis | Internal Models with Significant Unobservable Inputs (Level 3) | Warrants issued by UHI |  |
Financial Instruments |  |
Percentage of reasonably possible decrease in risk assumption | (10.00%) | (10.00%)
Potential Impact on Consolidated Equity Statement, Most Favourable Assumption | $ 3,377,623 | $ 3,492,229
Potential Impact on Consolidated Equity Statement, Least Favourable Assumption | $ (3,377,623) | $ (3,492,229)

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