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Post-Employment and Other Non-current Employee Benefits - Summary of Amounts and Types of Securities of Company's in Related Parties included in Portfolio Fund (Detail) - MXN ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Securities | Grupo Industrial Bimbo, S.A.B. de C. V.
Disclosure of Investment Securities [line items]
Investment funds in portfolio	$ 28	$ 26
Debt Securities | Grupo Financiero Banorte, S.A.B. de C.V.
Disclosure of Investment Securities [line items]
Investment funds in portfolio	9	8
Capital Securities | Fomento Económico Mexicano, S.A.B. de C.V.
Disclosure of Investment Securities [line items]
Investment funds in portfolio	3	2
Capital Securities | El Puerto de Liverpool, S.A.B. de C.V.
Disclosure of Investment Securities [line items]
Investment funds in portfolio	0	2
Capital Securities | Alfa, S.A.B. de C.V.
Disclosure of Investment Securities [line items]
Investment funds in portfolio	$ 0	$ 3

X

- Definition

The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 142
-Subparagraph f
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-URIDate 2019-03-27

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X

- Definition

Disclosure of investment securities.

+ References

No definition available.

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