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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, 2019 | Dec. 31, 2018
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Debt securities [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | $ 0 | $ 17
Debt securities [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 26 | 23
Debt securities [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 8 | 8
Debt securities [member] | Banco Compartamos Banco. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 0 | 4
Capital securities [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 0 | 1
Capital securities [member] | Walmart de Mexico S.A de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 0 | 6
Capital securities [member] | Fomento Econmico Mexicano, S.A.B de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 2 | 5
Capital securities [member] | El Puerto de Liverpool, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 2 | 3
Capital securities [member] | Grupo aeropuerto del sureste [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 0 | 2
Capital securities [member] | Alfa, S.A.B. de C.V. [Member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | $ 3 | $ 0

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