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Debt, Lease Liabilities and Other Notes Payable - Hedged Items (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  |  | $ 123,877,278 |  |
Warrants issued by UHI |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund |  | $ (1,403,384) |  |  |  |
Open Ended Fund |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund |  | (289,298) |  |  |  |
Designated as hedging instruments |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | $ 1,130.9 | 22,559,983 | $ 2,470.6 | $ 46,653,315
Recognized in: |  |  |  |  |  |
Comprehensive income | $ (7,343,244) | 2,030,424 |  |  |  |
Total foreign exchange (loss) gain derived from hedging Senior Notes | (7,343,244) | 2,030,424 |  |  |  |
Offset against: |  |  |  |  |  |
Total foreign currency translation and foreign exchange gain (loss) derived from hedged assets | 7,343,244 | (2,030,424) |  |  |  |
Designated as hedging instruments | Investment in shares of UHI |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund | 1,360,735 | (337,742) |  |  |  |
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
Offset against: |  |  |  |  |  |
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund | 5,511,412 | (1,403,384) |  |  |  |
Designated as hedging instruments | Open Ended Fund |  |  |  |  |  |
Offset against: |  |  |  |  |  |
Foreign exchange gain (loss) derived from the hedged Warrants issued by UHI and investments in Open-Ended Fund | $ 471,097 | $ (289,298) |  |  |  |
Designated as hedging instruments | Net investment | Investment in shares of UHI |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | 1,074.0 | 21,424,180 | 433.7 | 8,189,662
Designated as hedging instruments | Fair value hedge of foreign currency | Open Ended Fund |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Notional Amount |  |  | $ 56.9 | $ 1,135,803 | $ 248.3 | $ 4,688,202

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