v3.25.1
Post-Employment and Other Non-current Employee Benefits - Balances of Liabilities 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
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]        
Net defined benefit liability $ 1,654 $ 747 $ 912 $ 1,240
Post-employment and other non-current employee benefits 4,867 3,560    
Pension and Retirement Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Vested benefit obligation 978 653    
Non-vested benefit obligation 2,506 2,091    
Accumulated benefit obligation 3,484 2,744    
Excess of projected defined benefit obligation over accumulated benefit obligation 1,600 1,284    
Defined benefit obligation 5,084 4,028    
Pension plan funds at fair value (1,429) (1,303)    
Net defined benefit liability 3,655 2,725    
Seniority Premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Vested benefit obligation 500 320    
Non-vested benefit obligation 445 344    
Accumulated benefit obligation 945 664    
Excess of projected defined benefit obligation over accumulated benefit obligation 393 294    
Defined benefit obligation 1,338 958    
Pension plan funds at fair value (126) (123)    
Net defined benefit liability $ 1,212 $ 835