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Financial Instruments - Summarizes outstanding Cross Currency Swap Agreements (Detail) - MXN ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | $ 4,983 | $ 2,524
Cross-currency swaps | 2021 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount |  | 404
Derivative financial instruments liability |  | (4)
Derivative financial assets |  | 0
Cross-currency swaps | 2022 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 407 |
Derivative financial instruments liability | 0 |
Derivative financial assets | 45 |
Cross-currency swaps | 2023 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 11,733 | 11,371
Derivative financial instruments liability | 0 | 0
Derivative financial assets | 3,628 | 2,165
Cross-currency swaps | 2026 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 6,348 |
Derivative financial instruments liability | (1) |
Derivative financial assets | 220 |
Cross-currency swaps | 2027 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 7,204 | 6,982
Derivative financial instruments liability | 0 | (464)
Derivative financial assets | 366 | 80
Cross-currency swaps | 2030 | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 3,911 | 3,790
Derivative financial instruments liability | (8) | (107)
Derivative financial assets | $ 404 | $ 192

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