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Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, shares in Millions, R$ / shares in Millions, R$ in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Jan. 25, 2017 | Dec. 06, 2016 MXN ($) $ / shares shares | Dec. 06, 2016 BRL (R$) R$ / shares | Feb. 28, 2017 MXN ($) | Jan. 31, 2013 | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2018 BRL (R$) | Dec. 06, 2017 MXN ($) | Dec. 06, 2016 BRL (R$) shares
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, consideration transferred |  |  |  |  |  | $ 5,692 |  |  |  |
Purchase price allocation description |  |  |  |  |  | The Company is in the process of finalizing the allocation of the purchase price to the fair values of the identifiable assets acquired and liabilities assumed. This process is expected to be completed for each acquisition within12 months of the acquisition date. |  |  |  |
Goodwill |  |  |  |  |  | $ 111,347 | $ 118,130 |  |  |
Gain on derecognition of other comnprehensive income recognized in income statement |  |  |  |  |  |  | 2,996 |  |  |
Vonpar [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, consideration transferred |  | $ 20,992 |  |  |  |  |  |  |  | R$ 3,508
Name of acquire |  | Vonpar S.A. | Vonpar S.A. |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |  |  |  |  |  | 100.00%
Date of acquisition |  | Dec. 06, 2016 | Dec. 06, 2016 |  |  |  |  |  |  |
Business acquisition, cash paid |  | $ 13,198 |  |  |  |  |  |  |  | R$ 1,730
Business acquisition, additionally cash paid |  | 4,124 | R$ 688 |  |  |  |  |  |  |
Business acquisition, capitalized amount |  | 4,082 |  |  |  |  |  |  |  |
Equity interests of acquirer |  | 485 |  |  |  |  |  |  |  |
Transaction related costs |  | 35 |  |  |  |  |  |  |  |
Goodwill |  | $ (2,173) |  |  |  |  |  |  | $ 1,667 |
Vonpar [member] | Series L share [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued as consideration for business acquisition | shares |  | 27.9 |  |  |  |  |  |  |  | 27.9
Business acquisition, implicit value | $ / shares |  | $ 146.27 |  |  |  |  |  |  |  |
Strike price per share | $ / shares |  | $ 128.88 |  |  |  |  |  |  |  |
Equity interests of acquirer |  | $ 485 |  |  |  |  |  |  |  |
Vonpar [member] | Promissory notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining balance paid |  | $ 6,534 |  |  |  | $ 4,652 |  | R$ 916 |  | R$ 1,090
Annual rate |  | 0.375% |  |  |  | 0.375% |  | 0.375% |  | 0.375%
Maturity period |  | Three-year | Three-year |  |  |  |  |  |  |
Vonpar [member] | Promissory notes [member] | Series L share [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Strike price per share | (per share) |  | $ 178.5 | R$ 178.5 |  |  |  |  |  |  |
Coca-Cola FEMSA Philippines, Inc. [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  | 51.00% |  |  |  |  |
Term of of decision making authority |  |  |  |  | 4 years |  |  |  |  |
Description of control changes in CCFPI | Since January 25, 2017, the Company controls CCFPI's as all decisions relating to the day-to-day operation and management of CCFPI's business, including its annual normal operations plan |  |  |  |  |  |  |  |  |
Gain on derecognition of other comnprehensive income recognized in income statement |  |  |  | $ 2,996 |  |  | $ 2,996 |  |  |
Coca-Cola FEMSA Philippines, Inc. [member] | Call Options [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of non-controlling interest acquirable |  |  |  |  | 49.00% |  |  |  |  |
Non-controlling interest acquirable period |  |  |  |  | 7 years |  |  |  |  |
Alimentos y Bebidas del Atlntico [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Name of acquire |  |  |  |  |  | Alimentos y Bebidas del Atlántico, S.A. |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  | 100.00% |  |
Comercializadora y Distribuidora Los Volcanes S.A [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Name of acquire |  |  |  |  |  | Comercializadora y Distribuidora Los Volcanes S.A |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  | 100.00% |  |
Montevideo Refrescos S R L [member] |  |  |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Name of acquire |  |  |  |  |  | Montevideo Refrescos S.R.L. |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  | 100.00% |  |
Description of earn out |  |  |  |  |  | Reaching a market of 3.4 millions of consumers through 26 thousand points of sale, which isincluded in the consolidated financial results beginning on July 2018. |  |  |  |

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