XML 186 R124.htm IDEA: XBRL DOCUMENT
v3.20.1

Balances and Transactions in Foreign Currencies - Summary of Exchange Rates (Detail) - $ / $ | Apr. 24, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate |  | 18.8600 |
U.S. dollars [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate | 24.5883 | 18.8452 | 19.6829
Euro [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate | 26.5350 | 21.1223 | 22.5383

X
- Definition Disclosure of exchange rates. + References No definition available. + Details
Name: | fmx_DisclosureOfExchangeRatesLineItems
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_ClosingForeignExchangeRate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CurrencyAxis=fmx_USDollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=fmx_EuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |