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Employee Benefits - Amounts Recognized (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   $ 728 $ 433 $ 468
Remeasurements on the Net Defined Benefit Liability $ (24) (474) (1,090) 551
Net benefit cost recognized in the consolidated statements of income [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   656 433 468
Past service cost   73 116  
Gain or Loss on Settlement or Curtailment     2 (14)
Net Interest on the Net Defined Benefit Liability   450 379 387
Net benefit cost recognized in the consolidated statements of income [member] | Pension and retirement plans [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   372 279 318
Past service cost   73 (45)  
Gain or Loss on Settlement or Curtailment     2 (5)
Net Interest on the Net Defined Benefit Liability   305 290 304
Net benefit cost recognized in the consolidated statements of income [member] | Seniority premiums [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   239 139 125
Past service cost     161  
Gain or Loss on Settlement or Curtailment       (8)
Net Interest on the Net Defined Benefit Liability   91 57 49
Net benefit cost recognized in the consolidated statements of income [member] | Post retirement medical services [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   44 15 25
Gain or Loss on Settlement or Curtailment       (1)
Net Interest on the Net Defined Benefit Liability   54 32 34
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   2,849 2,166 646
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Pension and retirement plans [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   2,024 1,608 668
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Seniority premiums [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   483 162 (63)
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Post retirement medical services [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   $ 342 $ 396 $ 41