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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, 2018 | Dec. 31, 2017
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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 | $ 17 | $ 17
Debt securities [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 23 | 24
Debt securities [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 8 | 7
Debt securities [member] | Banco Compartamos Banco. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 4 |
Debt securities [member] | Gentera, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio |  | 8
Capital securities [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 1 |
Capital securities [member] | Gentera, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio |  | 4
Capital securities [member] | Walmart de Mexico S.A de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 6 |
Capital securities [member] | Fomento Econmico Mexicano, S.A.B de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 5 | 8
Capital securities [member] | El Puerto de Liverpool, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | 3 | 5
Capital securities [member] | Grupo aeropuerto del sureste [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio | $ 2 |
Capital securities [member] | Gruma, S.A.B. de C.V. [member] |  |
Disclosure of Investment Securities [line items] |  |
Investment funds in portfolio |  | $ 3

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