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Balances and Transactions in Foreign Currencies - Summary of Transactions in Foreign Currencies (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |
Revenues | $ 7,228 | $ 1,909 | $ 4,103
Other Operating Revenues | 139 | 1,679 | 1,431
Purchases of Raw Materials | 21,523 | 16,407 | 15,065
Interest Expense | 2,743 | 2,986 | 3,678
Consulting Fees | 774 | 302 | 410
Asset Acquisitions | 2,166 | 276 | 407
Other | 2,677 | 4,072 | 3,348
U.S. dollars [member] |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |
Revenues | 7,228 | 1,909 | 4,068
Other Operating Revenues | 130 | 1,677 | 1,281
Purchases of Raw Materials | 21,460 | 16,320 | 14,961
Interest Expense | 2,309 | 2,534 | 3,173
Consulting Fees | 752 | 267 | 182
Asset Acquisitions | 2,166 | 272 | 407
Other | 2,676 | 4,052 | 3,339
Euro [member] |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |
Revenues |  |  | 6
Other Operating Revenues |  | 2 |
Purchases of Raw Materials | 63 | 87 | 104
Interest Expense | 434 | 452 | 355
Consulting Fees | 20 | 23 | 43
Asset Acquisitions |  | 4 |
Other | 1 | 20 | 5
Other currencies [member] |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |
Revenues |  |  | 29
Other Operating Revenues | 9 |  | 150
Interest Expense |  |  | 150
Consulting Fees | $ 2 | $ 12 | 185
Other |  |  | $ 4

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- Definition Assets acquisitions through foreign currency. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Consulting fee through foreign currency. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line item abstract balances and transactions in foreign currencies. + References No definition available. + Details
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- Definition Interest expense through foreign currency. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other foreign currency transactions. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other revenue on exchange differences on translation. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Purchase of raw material through foreign currency. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Revenue through foreign currency. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |