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Financial Instruments - Disclosure of Sensitivity Analysis of Market Risks Management (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | (12.00%) | (13.00%) | (17.00%)
Effect on Equity | $ 116 | $ 141 | $ 293
Change in Exchange Rate | 12.00% | 13.00% | 17.00%
Effect on Equity | $ (116) | $ (141) | $ (293)
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%)
Effect on Equity |  | $ (2) | $ (12)
Change in Exchange Rate |  | 8.00% | 11.00%
Effect on Equity |  | $ 2 | $ 12
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 | (10.00%) | (8.00%) | (11.00%)
Effect on Profit or Loss | $ (368) | $ (373) | $ (549)
Change in Exchange Rate | 10.00% | 8.00% | 11.00%
Effect on Profit or Loss | $ 368 | $ 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 | (13.00%) | (12.00%) | (17.00%)
Effect on Profit or Loss | $ (2,706) | $ (3,651) | $ (3,836)
Change in Exchange Rate | 13.00% | 12.00% | 17.00%
Effect on Profit or Loss | $ 2,706 | $ 3,651 | $ 3,836
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 | (12.00%) | (9.00%) |
Effect on Profit or Loss | $ (283) | $ (304) |
Change in Exchange Rate | 12.00% | 9.00% |
Effect on Profit or Loss | $ 283 | $ 304 |
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 | (15.00%) | (14.00%) |
Effect on Profit or Loss | $ (27) | $ (23) |
Change in Exchange Rate | 15.00% | 14.00% |
Effect on Profit or Loss | $ 27 | $ 23 |
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 | (12.00%) | (13.00%) | (17.00%)
Effect on Profit or Loss | $ (8,596) | $ (8,077) | $ (3,176)
Change in Exchange Rate | 12.00% | 13.00% | 17.00%
Effect on Profit or Loss | $ 8,596 | $ 8,077 | $ 3,176
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 | (13.00%) | (12.00%) | (17.00%)
Effect on Equity | $ (668) | $ (625) | $ (916)
Change in Exchange Rate | 13.00% | 12.00% | 17.00%
Effect on Equity | $ 668 | $ 626 | $ 916
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 | (16.00%) | (14.00%) | (18.00%)
Effect on Equity | $ (413) | $ (234) | $ (203)
Change in Exchange Rate | 16.00% | 14.00% | 18.00%
Effect on Equity | $ 413 | $ 234 | $ 203
Coca-Cola FEMSA [member] | Forward agreements to purchase UYU 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%) |  |
Effect on Equity | $ (46) |  |
Change in Exchange Rate | 8.00% |  |
Effect on Equity | $ 46 |  |
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 | (12.00%) | (9.00%) | (18.00%)
Effect on Equity | $ (2) | $ (73) | $ (255)
Change in Exchange Rate | 12.00% | 9.00% | 18.00%
Effect on Equity | $ 2 | $ 73 | $ 255
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 | (27.00%) | (10.00%) |
Effect on Equity | $ (522) | $ (29) |
Change in Exchange Rate | 27.00% | 10.00% |
Effect on Equity | $ 522 | $ 29 |
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 | (13.00%) | (12.00%) | (17.00%)
Effect on Equity | $ (3,130) | $ (3,540) | $ (3,687)
Effect on Profit or Loss |  |  | $ (1,790)
Change in Exchange Rate | 13.00% | 12.00% | 17.00%
Effect on Equity | $ 3,130 | $ 3,540 | $ 3,687
Effect on Profit or Loss |  |  | $ 1,790
Coca-Cola 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 |  |  | (18.00%)
Effect on Profit or Loss |  |  | $ (448)
Change in Exchange Rate |  |  | 18.00%
Effect on Profit or Loss |  |  | $ 448
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 | (16.00%) | (14.00%) | (18.00%)
Effect on Equity | $ (9,068) | $ (7,483) | $ (9,559)
Change in Exchange Rate | 16.00% | 14.00% | 18.00%
Effect on Equity | $ 9,068 | $ 7,483 | $ 9,559
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] |  |  |
Effect on Profit or Loss | 1,868 | (553) | (105)
Effect on Profit or Loss | $ 1,868 | $ 553 | $ 105
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% | 30.00% | 33.00%
Effect on Equity | $ (341) | $ (32) | $ (310)
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 | 22.00% |  | 16.00%
Effect on Equity | $ (55) |  | $ (13)

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