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Financial Risk Management - Net Monetary Position (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2021 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($)
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
Percentage of reasonably possible increase in risk assumption |  |  | 10.00% | 10.00% | 10.00% | 10.00%
Percentage of reasonably possible decrease in risk assumption |  |  | 10.00% | 10.00% | 10.00% | 10.00%
Hypothetical foreign exchange gain | $ 6,345,797 | $ 5,705,342 |  |  |  |
Euros |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent monetary assets |  |  | $ 17.7 |  | $ 24.5 |
U.S. dollar equivalent monetary liabilities |  |  | (1.4) |  | (2.0) |
Foreign currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent monetary assets |  |  | 785.1 |  | 1,125.1 |
U.S. dollar equivalent monetary liabilities |  |  | (5,180.8) |  | (5,115.9) |
Net liability position |  |  | (4,395.7) |  | (3,990.8) |
Long-term debt designated as a hedging instrument of the Group's investments in UH II, UHI and the investment in Open-Ended Fund |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent monetary liabilities |  |  | $ (1,300.6) | $ (26,666,715) | $ (1,130.9) | $ (22,559,983)

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