Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Trust Assets (Detail) - MXN ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Disclosure Of Trust Assets [line items] | |||
| Foreign exchange rate valuation (gain) loss | $ 161 | $ (101) | $ (78) |
| Trust Assets | Pension and Retirement Plans | |||
| Disclosure Of Trust Assets [line items] | |||
| Balance at beginning of year | 1,303 | 1,288 | 1,234 |
| Actual return on trust assets | 142 | 41 | 50 |
| Foreign exchange rate valuation (gain) loss | 6 | (4) | 0 |
| Life annuities | (22) | 9 | 0 |
| Benefits paid | 0 | 0 | 4 |
| Plan amendments | 0 | (31) | 0 |
| Balance at end of year | 1,429 | 1,303 | 1,288 |
| Trust Assets | Seniority premiums | |||
| Disclosure Of Trust Assets [line items] | |||
| Balance at beginning of year | 123 | 128 | 133 |
| Actual return on trust assets | 3 | (5) | (5) |
| Balance at end of year | $ 126 | $ 123 | $ 128 |