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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) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]        
Net defined benefit liability $ 747 $ 912 $ 1,240 $ 1,173
Post-employment and other non-current employee benefits 3,560 3,709    
Pension and Retirement Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Vested benefit obligation 653 715    
Non-vested benefit obligation 2,091 2,196    
Accumulated benefit obligation 2,744 2,911    
Excess of projected defined benefit obligation over accumulated benefit obligation 1,284 1,288    
Defined benefit obligation 4,028 4,199    
Pension plan funds at fair value (1,303) (1,288)    
Net defined benefit liability 2,725 2,911    
Seniority Premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Vested benefit obligation 320 279    
Non-vested benefit obligation 344 255    
Accumulated benefit obligation 664 534    
Excess of projected defined benefit obligation over accumulated benefit obligation 294 392    
Defined benefit obligation 958 926    
Pension plan funds at fair value (123) (128)    
Net defined benefit liability $ 835 $ 798