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Other Current Assets and Other Financial Assets - Additional Information (Detail) - MXN ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of carrying amount and value in use of investments in associates and joint ventures [abstract]
Prepaid advertising and promotional expenses	$ 6,236	$ 6,578	$ 4,613

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- Definition

Disclosure of carrying amount and value in use of investments in associates and joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
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Period Type:	duration

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- Definition

Prepaid advertising and promotional expenses.

+ References

No definition available.

+ Details

Name:	fmx_PrepaidAdvertisingAndPromotionalExpenses
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant