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Post-Employment and Other Non-current Employee Benefits - Balances of Liabilities for Post-Employment and Other Non-Current Employee Benefits (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2020 USD ($) | [2] | Dec. 31, 2020 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |  |
Net defined benefit liability |  | $ 855 |  |  | $ 1,173 | $ 344 | $ 567
Total post-employment and other non-current employee benefits |  | 3,293 | [1] | $ 193 | 3,838 |  |
Pension and Retirement Plans |  |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |  |
Vested benefit obligation | $ 996 | 627 |  |  |  |  |
Non-vested benefit obligation | 1,644 | 1,421 |  |  |  |  |
Accumulated benefit obligation | 2,640 | 2,048 |  |  |  |  |
Excess of projected defined benefit obligation over accumulated benefit obligation | 1,671 | 1,864 |  |  |  |  |
Defined benefit obligation |  | 3,912 |  |  | 4,311 |  |
Pension plan funds at fair value |  | (1,122) |  |  | (1,201) |  |
Net defined benefit liability |  | 2,790 |  |  | 3,110 |  |
Seniority Premiums |  |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |  |
Vested benefit obligation | 307 | 214 |  |  |  |  |
Non-vested benefit obligation | 224 | 133 |  |  |  |  |
Accumulated benefit obligation | 531 | 347 |  |  |  |  |
Excess of projected defined benefit obligation over accumulated benefit obligation | $ 334 | 283 |  |  |  |  |
Defined benefit obligation |  | 630 |  |  | 865 |  |
Pension plan funds at fair value |  | (127) |  |  | (137) |  |
Net defined benefit liability |  | $ 503 |  |  | $ 728 |  |
[1] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] | Convenience translation to U.S. dollars ($) – See Note 2.2.3

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