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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Trust Assets [line items]      
Foreign exchange rate valuation (gain) loss $ (101) $ (78) $ 9
Trust Assets | Pension and Retirement Plans      
Disclosure Of Trust Assets [line items]      
Balance at beginning of year 1,288 1,234 1,201
Actual return on trust assets 41 50 33
Foreign exchange rate valuation (gain) loss (4) 0 0
Life annuities 9 0 0
Benefits paid 0 4 0
Plan amendments (31) 0 0
Balance at end of year 1,303 1,288 1,234
Trust Assets | Seniority premiums      
Disclosure Of Trust Assets [line items]      
Balance at beginning of year 128 133 137
Actual return on trust assets (5) (5) (4)
Balance at end of year $ 123 $ 128 $ 133