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Subsequent Events - Additional Information (Detail) $ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2020 MXN ($) | Feb. 27, 2020 | Jan. 22, 2020 USD ($) | Jan. 09, 2020 | Dec. 13, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 MXN ($) | Mar. 09, 2020 USD ($) | Feb. 13, 2020 USD ($) | Feb. 12, 2020 USD ($) | Feb. 07, 2020 MXN ($) | Jan. 16, 2020 USD ($)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 0.40% |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  | 0.40% |  |  |  |  |  |
Three Point Eight Eight Percentage Senior Notes Maturing On November Twenty Six Two Thousand Twenty Three [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.88% |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | November 26, 2023 |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  | 3.88% |  |  |  |  |  |
Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ownership interest |  |  |  |  |  | 47.20% | 47.20% |  |  |  |  |  |
Grupo Socofar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ownership interest |  |  |  |  | 40.00% | 100.00% | 60.00% |  |  |  |  |  |
Dividend announcement [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary dividend payable | $ 10,360 |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved date | Mar. 20, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Events after reporting period [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  | $ 1,800 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.577% | 3.50% |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  | 3.577% | 3.50% |  |
short-term bank loan |  |  |  |  |  |  |  | $ 15,000 |  |  |  |  |
Events after reporting period [member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.50%
Adjustment for reference rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.30%
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.50%
Events after reporting period [member] | Senior Unsecured Notes Due Twenty Twenty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  | $ 300 |  |
Adjustment for reference rate |  |  |  |  |  |  |  |  |  |  | 1.375% |  |
Events after reporting period [member] | Coca-Cola FEMSA [member] | Senior Unsecured Notes Due Two Thousand Thirty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  | $ 1,250 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.75% |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 2.75% |  |  |  |  |  |  |  |  |  |
Events after reporting period [member] | Coca-Cola FEMSA [member] | Eight Year Fixed Rate Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 7.35% |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 7.35% |
Events after reporting period [member] | Coca-Cola FEMSA [member] | TIIE Plus Zero Point Eight Percentage Debt Bonds Maturing On Two Thousand Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  |  | $ 1,727 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 0.08% |
Maturity date |  | August 2025 |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 0.08% |
Events after reporting period [member] | Grupo Socofar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ownership interest |  |  |  | 40.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Three Point Eight Eight Percentage Senior Notes Maturing On November Twenty Six Two Thousand Twenty Three [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.88% |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | November 26, 2023 |  |  |  |  |  |  |  |  |  |
Repayment of borrowings |  |  | $ 900 |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.88% |  |  |  |  |  |  |  |  |  |
Major business combination [member] | WAXIE And North American [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired controlling interest |  |  |  |  |  |  |  |  | 90.00% |  |  |  |
Business acquisition, consideration transferred |  |  |  |  |  |  |  |  | $ 900 |  |  |  |

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