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Bonus Programs - Summary of Shares Granted Under the Company's Executive Incentive Plans (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	0	0	0
2013 incentive plan [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2014
2013 incentive plan [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2016
2014 incentive plan [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2015
2014 incentive plan [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2017
2015 incentive plan [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2016
2015 incentive plan [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2018
2016 incentive plan [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2017
2016 incentive plan [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2019
2017 incentive plan [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2018
2017 incentive plan [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2020
FEMSA [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	2,380,522
FEMSA [member] | 2013 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	539,020
FEMSA [member] | 2014 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	489,345
FEMSA [member] | 2015 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	457,925
FEMSA [member] | 2016 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	567,671
FEMSA [member] | 2017 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	326,561
KOF [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	2,205,663
KOF [member] | 2013 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	370,200
KOF [member] | 2014 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	331,165
KOF [member] | 2015 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	415,375
KOF [member] | 2016 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	719,132
KOF [member] | 2017 incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	369,791

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_ii&doctype=Standard
-URIDate 2017-03-09

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- Definition

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+ References

No definition available.

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