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Employee Benefits - Amounts Recognized (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   $ 766 $ 729 $ 549
Remeasurements on the Net Defined Benefit Liability $ 14 296 (474) (1,090)
Net benefit cost recognized in the consolidated statements of income        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   724 656 433
Past service cost   42 73 116
Gain or Loss on Settlement or Curtailment   (82)   2
Net Interest on the Net Defined Benefit Liability   485 450 379
Net benefit cost recognized in the consolidated statements of income | Pension and retirement plans        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   390 372 279
Past service cost   39 73 (45)
Gain or Loss on Settlement or Curtailment   (55)   2
Net Interest on the Net Defined Benefit Liability   319 305 290
Net benefit cost recognized in the consolidated statements of income | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   290 239 139
Past service cost   1   161
Gain or Loss on Settlement or Curtailment   (3)    
Net Interest on the Net Defined Benefit Liability   114 91 57
Net benefit cost recognized in the consolidated statements of income | Post retirement medical services        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost   44 44 15
Past service cost   2    
Gain or Loss on Settlement or Curtailment   (24)    
Net Interest on the Net Defined Benefit Liability   52 54 32
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   2,812 2,849 2,166
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Pension and retirement plans        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   1,757 2,024 1,608
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   853 483 162
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Post retirement medical services        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability   $ 202 $ 342 $ 396