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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, 2019 | Dec. 31, 2018
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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 Industrial Bimbo, S.A.B. de C. V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 31 | 27
Debt [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 8 | 8
Debt [member] | Grupo Financiero Scotiabank Inverlat, S.A. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 10 |
Debt [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | 45
Debt [member] | Gentera, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | 4
Debt [member] | Grupo BBVA Bancomer, S.A. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 20 | 19
Capital [member] | El Puerto de Liverpool, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 2 | 3
Capital [member] | Otros [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 3 |
Capital [member] | Grupo Televisa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | 1
Capital [member] | CEMEX, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 12 | 3
Capital [member] | Alfa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | $ 6 |
Capital [member] | Grupo Aeroportuario del Suereste, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities |  | $ 2

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