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Investments in Other Entities - Additional Information (Detail) $ in Millions, $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 MXN ($)
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Fair value loss on investment |  | $ 0 | [1] | $ 0 | $ 216 | [2] | $ 1,039 |
Financial assets |  | $ 8 |  |  |  |  |  | $ 8
Impairment of investments |  |  |  | 2,501 | 948 |  | 432 |
Venezuela |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Fair value loss on investment |  |  |  | 0 |  |  |  |
Compañía Panameña de Bebidas, S.A.P.I. de C.V. |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Percentage of stock sold | 100.00% |  |  |  |  |  |  |
Compañía Panameña de Bebidas, S.A.P.I. de C.V. |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Impairment of investments |  |  |  | 1,463 | 948 |  |  |
Leao Alimentos y Bebidas LTDA |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Impairment of investments |  |  |  | 1,038 |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Equity earnings (loss) recognized |  |  |  | (157) | (215) |  | (270) |
Compañía Panameña de Bebidas, S.A.P.I. de C.V. |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Capital contribution |  |  |  | 1,302 | 111 |  |  |
Industria Envasadora de Quertaro, S.A. de C.V. (IEQSA) |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Dividend income |  |  |  | 16 |  |  |  |
Promotora Mexicana de Embotelladores, S.A. de C.V. |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Dividend income |  |  |  |  | 1 |  |  |
Jugos del Valle, S.A.P.I. de C.V. |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Capital contribution |  |  |  | 23 | 204 |  |  |
Associates |  |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |  |
Equity earnings (loss) recognized |  |  |  | $ (124) | $ 84 |  | $ 44 |
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18

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