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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
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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

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