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Financial Instruments - Summarizes Sugar Price and Aluminum Price Contracts (Detail) $ in Millions | Dec. 31, 2021 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | $ 4,983,000,000 | $ 2,524,000,000 |
2032 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount | 6,175,000,000 |  |
Derivative financial instruments liability | 0 |  |
Derivative financial assets | 170,000,000 |  |
Cash flow hedges | Aluminum price contracts | 2021 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount |  | 695,000,000 |
Derivative financial instruments liability |  | 0 |
Derivative financial assets |  | 125,000,000 |
Cash flow hedges | Aluminum price contracts | 2022 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount | 102,000,000 |  | $ 99
Derivative financial instruments liability | 0 |  | 0
Derivative financial assets | 62,000,000 |  | $ 17
Cash flow hedges | PX+MEG (in millions of pesos) | 2021 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount |  | 729,000,000 |
Derivative financial instruments liability |  | (65,000,000) |
Derivative financial assets |  | 0 |
Cash flow hedges | PX+MEG (in millions of pesos) | 2022 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount | 470,000,000 |  |
Derivative financial instruments liability | (28,000,000) |  |
Derivative financial assets | 5,000,000 |  |
Cash flow hedges | Sugar price contracts | 2021 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount |  | 1,260,000,000 |
Derivative financial instruments liability |  | (18,000,000) |
Derivative financial assets |  | 275,000,000 |
Cash flow hedges | Sugar price contracts | 2022 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount | 2,020,000,000 | 366,000,000 |
Derivative financial instruments liability | (7,000,000) | 0 |
Derivative financial assets | 502,000,000 | $ 70,000,000 |
Cash flow hedges | Sugar price contracts | 2023 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional Amount | 769,000,000 |  |
Derivative financial instruments liability | 0 |  |
Derivative financial assets | $ 195,000,000 |  |

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