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Financial Instruments - Summarizes outstanding Cross Currency Swap Agreements (Detail) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | $ 2,524 | $ 9
2020 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount |  | 4,365
Derivative financial instruments liability |  | (142)
Derivative financial assets |  | 0
Cross-currency swaps | 2020 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount |  | 13,788
Derivative financial instruments liability |  | (297)
Derivative financial assets |  | 781
Cross-currency swaps | 2021 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 404 | 0
Derivative financial instruments liability | (4) | 0
Derivative financial assets | 0 | 0
Cross-currency swaps | 2023 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 11,371 | 10,742
Derivative financial instruments liability | 0 | (594)
Derivative financial assets | 2,165 | 0
Cross-currency swaps | 2027 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 6,982 | 6,596
Derivative financial instruments liability | (464) | (843)
Derivative financial assets | 80 | $ 0
Cross-currency swaps | 2030 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 3,790 |
Derivative financial instruments liability | (107) |
Derivative financial assets | $ 192 |

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