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Investments in Associates and Joint Ventures - Additional Information (Detail) € / shares in Units, € in Millions, $ in Millions, $ in Millions |  |  |  |  |  | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |  |
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Sep. 18, 2017 € / shares shares | Jun. 25, 2017 MXN ($) | Mar. 28, 2017 MXN ($) | Dec. 06, 2016 | Apr. 30, 2010 | Dec. 31, 2017 MXN ($) | Aug. 31, 2017 | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 MXN ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 MXN ($) | Dec. 31, 2015 EUR (€) | Apr. 20, 2018 EUR (€) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  | $ 3,348 |  | $ 3,348 |  | $ 3,348 |  |  |  |  | $ 170 |  |
Other changes in equity |  |  |  |  |  |  |  |  |  | (485) |  |  |  |  |  |  |
Amortisation expense related to net income attributable to equity holders |  |  |  |  |  |  |  | 1,259 |  | 1,016 |  | $ 604 |  |  |  |  |
Net income corresponding to the immaterial associates |  |  |  |  |  |  |  | 235 |  | 31 |  | 185 |  |  |  |  |
Net income (loss) corresponding to the immaterial joint ventures |  |  |  |  |  |  |  | (175) |  | 116 |  | (30) |  |  |  |  |
Promotora Mexicana de Embotelladores, S.A. de C.V. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |
Compania Panamena de Bebidas, S.A.P.I. de C.V. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  | 349 |  | $ 349 |  | 419 |  |  |  |  |  |  |
Estancia Hidromineral Itabirito, LTDA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  | 190 |  |  |  |  |  |  |
Leao Alimentos e Bebidas, LTDA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests increased portion through acquisition |  |  |  | 3.36% |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  |  |  |  |  | $ 1,273 |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  | 24.70% | 24.70% | 27.70% | 27.70% |  |  |  |  |  |
Leao Alimentos e Bebidas, LTDA [member] | Spal Industria Brasileria de Bebidas, S.A.[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interests divested in associate |  | 3.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other changes in equity |  | $ 198 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 5 |  |  |  |  |  |  |
Promotora Industrial Azucarera, S.A. de C.V. ("PIASA") [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution |  |  |  |  |  | $ 182 |  | $ 182 |  | $ 376 |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  | 36.40% | 36.40% | 36.40% | 36.40% |  |  |  |  |  |
Heineken [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  | $ 3,250 |  | $ 3,263 |  | $ 2,343 |  |  |  |  |
Ownership Percentage |  |  |  |  | 20.00% | 14.80% | 20.00% | 14.76% | 14.76% | 20.00% | 20.00% | 20.00% | 20.00% |  |  |  |
Portion of investment sold | 5.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity income recognized from ownership interest, net of tax |  |  |  |  |  |  |  | $ 7,847 |  | $ 6,342 |  | $ 5,879 |  |  |  |  |
Amortisation expense related to net income attributable to equity holders |  |  |  |  |  |  |  | $ 7,656 | € 357 | $ 6,430 | € 308 | $ 6,567 | € 378 |  |  |  |
Heineken Company [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  | 8.63% | 8.63% | 12.53% | 12.53% |  |  |  |  |  |
Number of shares sold | shares | 22,485,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | € / shares | € 84.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investments in accociates representing 20% of its outstanding shares |  |  |  |  |  | $ 141,693 |  | $ 141,693 |  | $ 173,857 |  |  |  |  |  | € 6,011 | € 7,989
Heineken Company [member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment in joint ventures | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 6,157 |  |  |
Heineken Holding N.V. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  | 12.26% | 12.26% | 14.94% | 14.94% |  |  |  |  |  |
Number of shares sold | shares | 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | € / shares | € 78.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vonpar SA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
AdeS [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other changes in equity |  |  | $ 587 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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