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Equity Accounted Investees - Activity (Detail) € / shares in Units, € in Millions, $ in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
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Sep. 30, 2020 | Sep. 18, 2017 € / shares shares | Apr. 30, 2010 | Sep. 30, 2020 | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($)
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  | $ 3,348 |  |  | $ 168 | $ 3,348
Ownership Percentage, Associate |  |  |  |  | 14.80% | 14.80% | 14.80% | 14.80% |  |  |  |
Impairment loss |  |  |  |  |  | $ 5,451 |  | $ 1,018 |  | $ 432 |  |
Estrella Azul [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  |  |  | 100.00% |  |  |  |  |  |  |  |
Portion of investment sold |  |  |  | 100.00% |  |  |  |  |  |  |  |
Promotora Mexicana de Embotelladores, S.A. de C.V. [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  | 1 |  |  |  |
Compania Panamena de Bebidas, S.A.P.I. de C.V. [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on investments |  |  |  |  |  | 1,463 |  |  |  |  |  |
Proportion of ownership interest sold | 100.00% |  |  |  |  |  |  |  |  |  |  |
Financial asset recognized on sale |  |  |  |  |  |  |  |  |  |  |  | 8
Capital contribution |  |  |  |  |  |  |  |  |  |  |  | 1,302
Portion of investment sold | 100.00% |  |  |  |  |  |  |  |  |  |  |
Compania Panamena de Bebidas, S.A.P.I. de C.V. [member] | Other Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on investments |  |  |  |  |  |  |  | 948 |  |  |  |
Leao Alimentos y Bebidas LTDA |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on investments |  |  |  |  |  | 1,038 |  |  |  |  |  |
Industria Envasadora de Quertaro, S.A. de C.V. (IEQSA) [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  | $ 16 |  |  |  |  |  |
Promotora Industrial Azucarera, S.A. de C.V. ("PIASA") [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  | $ 111 |  |  |  |
Ownership Percentage, Associate |  |  |  |  | 36.40% | 36.40% | 36.40% | 36.40% |  |  |  |
Heineken Group |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  | 5.20% |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  | $ 2,322 |  | $ 3,031 |  | 2,872 |  |
Ownership Percentage, Associate |  |  | 20.00% |  | 14.76% | 14.76% | 14.76% | 14.76% |  |  |  |
Portion of investment sold |  | 5.20% |  |  |  |  |  |  |  |  |  |
Equity income recognized from ownership interest, net of tax |  |  |  |  |  | $ (434) |  | $ 6,428 |  | 6,478 |  |
Share of net income exclusive of amortisation adjustments |  |  |  |  | € (30) | $ (842) | € 319 | 6,885 | € 281 | $ 6,320 |  |
Heineken NV |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold | shares |  | 22,485,000 |  |  |  |  |  |  |  |  |  |
Share price | € / shares |  | € 84.50 |  |  |  |  |  |  |  |  |  |
Heineken Holding N.V. [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold | shares |  | 7,700,000 |  |  |  |  |  |  |  |  |  |
Share price | € / shares |  | € 78.00 |  |  |  |  |  |  |  |  |  |
Jugos del Valle, S.A.P.I. de C.V. [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  | $ 204 |  |  |  | $ 23
Ownership Percentage, Associate |  |  |  |  | 28.80% | 28.80% | 28.80% | 28.80% |  |  |  |

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