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Employee Benefits - Securities in Related Parties Included in Portfolio Fund (Detail) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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 | 5 | 31
Debt [member] | Grupo BBVA Bancomer, S.A. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 10 | 20
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 Financiero Scotiabank Inverlat, S.A. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 10 | 10
Capital [member] | El Puerto de Liverpool, 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 | 8 | 12
Capital [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 8 | 1
Capital [member] | Alfa, S.A.B. de C.V. [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | 3 | 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 |
Capital [member] | Other [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investments in securities | $ 4 | $ 3

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