v3.25.1
Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Defined Benefit Obligation for Post-Employment and Other Non-Current Employee Benefits (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Foreign exchange rate valuation (gain) loss $ 161 $ (101) $ (78)
Pension and Retirement Plans | Present Value of Defined Benefit Obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year 4,028 4,199 4,515
Current Service Cost 235 233 246
Effect of curtailment (108) (144) (86)
Interest expense 361 346 317
Actuarial (gains) or losses 726 (214) (355)
Foreign exchange rate valuation (gain) loss 203 (151) (134)
Benefits paid (462) (378) (355)
Past service cost 101 137 47
Business acquisitions 0 0 4
Balance at end of year 5,084 4,028 4,199
Seniority premiums | Present Value of Defined Benefit Obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year 958 926 978
Current Service Cost 96 87 94
Effect of curtailment (8) (14) (9)
Interest expense 97 88 76
Actuarial (gains) or losses 339 29 (97)
Benefits paid (183) (166) (128)
Past service cost 39 8 6
Business acquisitions 0 0 6
Balance at end of year $ 1,338 $ 958 $ 926