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Financial Instruments - Disclosure of Sensitivity Analysis of Market Risks Management (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | (9.00%) | (12.00%) | (13.00%)
Effect on Equity | $ (57) | $ (116) | $ (141)
Change in Exchange Rate | 9.00% | 12.00% | 13.00%
Effect on Equity | $ 57 | $ 116 | $ 141
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 | (13.00%) |  |
Effect on Equity | $ (202) |  |
Change in Exchange Rate | 13.00% |  |
Effect on Equity | $ 202 |  |
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%)
Effect on Equity |  |  | $ (2)
Change in Exchange Rate |  |  | 8.00%
Effect on Equity |  |  | $ 2
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 | (11.00%) | (10.00%) | (8.00%)
Effect on Profit or Loss | $ (546) | $ (368) | $ (373)
Change in Exchange Rate | 11.00% | 10.00% | 8.00%
Effect on Profit or Loss | $ 546 | $ 368 | $ 373
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 | (9.00%) | (13.00%) | (12.00%)
Effect on Profit or Loss | $ (1,805) | $ (2,706) | $ (3,651)
Change in Exchange Rate | 9.00% | 13.00% | 12.00%
Effect on Profit or Loss | $ 1,805 | $ 2,706 | $ 3,651
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 | (10.00%) | (12.00%) | (9.00%)
Effect on Profit or Loss | $ (286) | $ (283) | $ (304)
Change in Exchange Rate | 10.00% | 12.00% | 9.00%
Effect on Profit or Loss | $ 286 | $ 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 | (13.00%) | (15.00%) | (14.00%)
Effect on Profit or Loss | $ (177) | $ (27) | $ (23)
Change in Exchange Rate | 13.00% | 15.00% | 14.00%
Effect on Profit or Loss | $ 177 | $ 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 | (9.00%) | (12.00%) | (13.00%)
Effect on Profit or Loss | $ (3,833) | $ (8,596) | $ (8,077)
Change in Exchange Rate | 9.00% | 12.00% | 13.00%
Effect on Profit or Loss | $ 3,833 | $ 8,596 | $ 8,077
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 | (9.00%) | (13.00%) | (12.00%)
Effect on Equity | $ (739) | $ (668) | $ (626)
Change in Exchange Rate | 9.00% | 13.00% | 12.00%
Effect on Equity | $ 739 | $ 668 | $ 626
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 | (13.00%) | (16.00%) | (14.00%)
Effect on Equity | $ (155) | $ (413) | $ (234)
Change in Exchange Rate | 13.00% | 16.00% | 14.00%
Effect on Equity | $ 155 | $ 413 | $ 234
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 | (5.00%) | (8.00%) |
Effect on Equity | $ (23) | $ (46) |
Change in Exchange Rate | 5.00% | 8.00% |
Effect on Equity | $ 23 | $ 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 | (10.00%) | (12.00%) | (9.00%)
Effect on Equity | $ (54) | $ (2) | $ (73)
Change in Exchange Rate | 10.00% | 12.00% | 9.00%
Effect on Equity | $ 54 | $ 2 | $ 73
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 | (25.00%) | (27.00%) | (10.00%)
Effect on Equity | $ (88) | $ (522) | $ (29)
Change in Exchange Rate | 25.00% | 27.00% | 10.00%
Effect on Equity | $ 88 | $ 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 | (9.00%) | (13.00%) | (12.00%)
Effect on Equity | $ (2,315) | $ (3,130) | $ (3,540)
Change in Exchange Rate | 9.00% | 13.00% | 12.00%
Effect on Equity | $ 2,315 | $ 3,130 | $ 3,540
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 | (13.00%) | (16.00%) | (14.00%)
Effect on Equity | $ (645) | $ (9,068) | $ (7,483)
Change in Exchange Rate | 13.00% | 16.00% | 14.00%
Effect on Equity | $ 645 | $ 9,068 | $ 7,483
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 | (8.00%) | (13.00%) | (12.00%)
Effect on Profit or Loss | $ (940) | $ (1,868) | $ (553)
Change in Exchange Rate | 8.00% | 13.00% | 12.00%
Effect on Profit or Loss | $ 940 | $ 1,868 | $ 553
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 | 24.00% | 30.00% | 30.00%
Effect on Equity | $ (255) | $ (341) | $ (32)
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 | 15.00% | 22.00% |
Effect on Equity | $ (1,164) | $ (55) |

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