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Debt, Lease Liabilities and Other Notes Payable - Hedged Items (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  |  | $ 122,378,292 |  |
Warrants issued by UHI |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedge Open Ended Fund | $ (1,403,384) | $ 125,955 |  |  |  |
Open Ended Fund |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedge Open Ended Fund | (289,298) | (317,126) |  |  |  |
Designated as hedging instruments |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | $ 2,470.6 | 46,653,315 | $ 2,585.8 | $ 50,869,542
Recognized in: |  |  |  |  |  |
Comprehensive income | 2,030,424 | (189,213) |  |  |  |
Total foreign exchange (loss) gain derived from hedging Senior Notes | 2,030,424 | (189,213) |  |  |  |
Offset against: |  |  |  |  |  |
Total foreign currency translation and foreign exchange gain (loss) derived from hedged assets | (2,030,424) | 189,213 |  |  |  |
Designated as hedging instruments | Investment in shares of UHI |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedge Open Ended Fund | (337,742) | (1,958) |  |  |  |
Designated as hedging instruments | Warrants issued by UHI |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | 1,788.6 | 33,775,451 | 1,775.1 | 34,921,530
Offset against: |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedge Open Ended Fund | (1,403,384) | (125,955) |  |  |  |
Designated as hedging instruments | Open Ended Fund |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedge Open Ended Fund | $ (289,298) | $ 317,126 |  |  |  |
Designated as hedging instruments | Net investment | Investment in shares of UHI |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | 433.7 | 8,189,662 | 421.2 | 8,285,286
Designated as hedging instruments | Fair value hedge of foreign currency | Open Ended Fund |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | $ 248.3 | $ 4,688,202 | $ 389.5 | $ 7,662,726

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