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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, 2018 | Dec. 31, 2017
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Debt [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | $ 45 | $ 28
Debt [member] | El Puerto de Liverpool, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 30 | 30
Debt [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 8 |
Debt [member] | Grupo BBVA Bancomer, S.A. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 19 | 10
Debt [member] | Gentera, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 4 |
Debt [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 27 | $ 5
Capital [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 1 |
Capital [member] | El Puerto de Liverpool, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 3 |
Capital [member] | Grupo Aeroportuario del Suereste, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 2 |
Capital [member] | CEMEX, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | $ 3 |

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