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Financial Instruments - Disclosure of Sensitivity Analysis of Market Risks Management (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
FEMSA [member] | Cross currency swaps of CLP against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (8.00%) | (11.00%) |
Effect on Profit or Loss | $ (373) | $ (549) |
Change in Exchange Rate | 8.00% | 11.00% |
Effect on Profit or Loss | $ 373 | $ 549 |
FEMSA [member] | Cross currency swaps of MXN against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (12.00%) | (17.00%) | (11.00%)
Effect on Profit or Loss | $ (3,651) | $ (3,836) | $ (2,043)
Change in Exchange Rate | 12.00% | 17.00% | 11.00%
Effect on Profit or Loss | $ 3,651 | $ 3,836 | $ 2,043
FEMSA [member] | Cross Currency Swaps of COP Against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (9.00%) | (18.00%) |
Effect on Profit or Loss | $ (304) | $ (448) |
Change in Exchange Rate | 9.00% | 18.00% |
Effect on Profit or Loss | $ 304 | $ 448 |
FEMSA [member] | Cross currency swaps Of MXN against BRL [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (14.00%) |  |
Effect on Profit or Loss | $ (23) |  |
Change in Exchange Rate | 14.00% |  |
Effect on Profit or Loss | $ 23 |  |
FEMSA [member] | Forward agreements to purchase MXN currency against EUR [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (13.00%) | (17.00%) | (14.00%)
Effect on Equity | $ 141 | $ 293 | $ 319
Change in Exchange Rate | 13.00% | 17.00% | 14.00%
Effect on Equity | $ (141) | $ (293) | $ (319)
FEMSA [member] | Forward agreements to purchase CLP currency against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (8.00%) | (11.00%) | (10.00%)
Effect on Equity | $ (2) | $ (12) | $ (9)
Change in Exchange Rate | 8.00% | 11.00% | 10.00%
Effect on Equity | $ 2 | $ 12 | $ 9
FEMSA [member] | Forward agreements to purchase MXN currency against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate |  |  | (11.00%)
Effect on Equity |  |  | $ 197
FEMSA [member] | Net Cash in Foreign Currency of Euro Against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (13.00%) | (17.00%) | (14.00%)
Effect on Profit or Loss | $ (8,077) | $ (3,176) | $ (504)
Change in Exchange Rate | 13.00% | 17.00% | 14.00%
Effect on Profit or Loss | $ 8,077 | $ 3,176 | $ 504
Coca-Cola FEMSA [member] | Cross currency swaps of MXN against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (12.00%) | (17.00%) | (11.00%)
Effect on Equity | $ (3,540) | $ (3,687) |
Effect on Profit or Loss |  | $ (1,790) | $ (938)
Change in Exchange Rate | 12.00% | 17.00% | 11.00%
Effect on Equity | $ 3,540 | $ 3,687 |
Effect on Profit or Loss |  | $ 1,790 | $ 938
Coca-Cola FEMSA [member] | Cross currency swaps of BRL against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (14.00%) | (18.00%) | (21.00%)
Effect on Equity | $ (7,483) | $ (9,559) | $ (4,517)
Effect on Profit or Loss |  |  | $ (1,086)
Change in Exchange Rate | 14.00% | 18.00% | 21.00%
Effect on Equity | $ 7,483 | $ 9,559 | $ 4,517
Effect on Profit or Loss |  |  | $ 1,086
Coca-Cola FEMSA [member] | Commodity Price Contracts of Sugar in USD [member] | Commodity Price Risk [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Rate | 30.00% | 33.00% | 31.00%
Effect on Equity | $ (32) | $ (310) | $ (406)
Coca-Cola FEMSA [member] | Commodity Price Contracts of Aluminium in USD [member] | Commodity Price Risk [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Rate |  | 16.00% | 18.00%
Effect on Equity |  | $ (13) | $ (58)
Coca-Cola FEMSA [member] | Forward agreements to purchase MXN currency against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (12.00%) | (17.00%) | 11.00%
Effect on Equity | $ (625) | $ (916) | $ (197)
Change in Exchange Rate | 12.00% | 17.00% |
Effect on Equity | $ 626 | $ 916 |
Coca-Cola FEMSA [member] | Forward agreements to purchase COP currency against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (9.00%) | (18.00%) | (17.00%)
Effect on Equity | $ (73) | $ (255) | $ 113
Change in Exchange Rate | 9.00% | 18.00% | 17.00%
Effect on Equity | $ 73 | $ 255 | $ (113)
Coca-Cola FEMSA [member] | Forward agreements to purchase BRL currency against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (14.00%) | (18.00%) | (21.00%)
Effect on Equity | $ (234) | $ (203) | $ 387
Change in Exchange Rate | 14.00% | 18.00% | 21.00%
Effect on Equity | $ 234 | $ 203 | $ (387)
Coca-Cola FEMSA [member] | Forward agreements to purchase ARS currency against USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (10.00%) |  | (36.00%)
Effect on Equity | $ (29) |  | $ 231
Change in Exchange Rate | 10.00% |  | 36.00%
Effect on Equity | $ 29 |  | $ (231)
Coca-Cola FEMSA [member] | Net Cash in Foreign Currency of USD [member] | Foreign currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in Exchange Rate | (12.00%) | (17.00%) | (11.00%)
Effect on Profit or Loss | $ 553 | $ 105 | $ 1,112
Change in Exchange Rate | 12.00% | 17.00% | 11.00%
Effect on Profit or Loss | $ (553) | $ (105) | $ (1,112)

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