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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)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2020
USD ($)
 [2]
Dec. 31, 2020
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of net defined benefit liability (asset) [line items]            
Net defined benefit liability   $ 855   $ 1,173 $ 344 $ 567
Total post-employment and other non-current employee benefits   3,293 [1] $ 193 3,838    
Pension and Retirement Plans            
Disclosure of net defined benefit liability (asset) [line items]            
Vested benefit obligation $ 996 627        
Non-vested benefit obligation 1,644 1,421        
Accumulated benefit obligation 2,640 2,048        
Excess of projected defined benefit obligation over accumulated benefit obligation 1,671 1,864        
Defined benefit obligation   3,912   4,311    
Pension plan funds at fair value   (1,122)   (1,201)    
Net defined benefit liability   2,790   3,110    
Seniority Premiums            
Disclosure of net defined benefit liability (asset) [line items]            
Vested benefit obligation 307 214        
Non-vested benefit obligation 224 133        
Accumulated benefit obligation 531 347        
Excess of projected defined benefit obligation over accumulated benefit obligation $ 334 283        
Defined benefit obligation   630   865    
Pension plan funds at fair value   (127)   (137)    
Net defined benefit liability   $ 503   $ 728    
[1] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] Convenience translation to U.S. dollars ($) – See Note 2.2.3