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Employee Benefits - Summary of Amounts and Types of Securities in Related Parties Included in Portfolio Fund (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Debt [member] | Cementos Mexicanos. S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | $ 7
Debt [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | $ 28 | 45
Debt [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | 7
Debt [member] | BBVA Bancomer, S.A. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 10 |
Debt [member] | El Puerto de Liverpool, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 30 | 5
Debt [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | $ 5 | 19
Debt [member] | Gentera, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | 8
Capital [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | $ 6

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