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Employee Benefits - Effect of variation in assumptions (Details) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Percentage of reasonably possible decrease in actuarial assumption 1.00%    
Current service cost $ 766 $ 729 $ 549
Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 5,063 4,891  
Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 1,975 1,626  
Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) $ 562 736  
Discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Percentage of reasonably possible increase in actuarial assumption 1.00%    
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
Gain or Loss on Settlement or Curtailment (82)   2
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 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
Gain or Loss on Settlement or Curtailment (55)   2
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 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
Gain or Loss on Settlement or Curtailment (3)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 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
Gain or Loss on Settlement or Curtailment (24)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 52 $ 54 $ 32
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 699    
Gain or Loss on Settlement or Curtailment (76)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 373    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 394    
Gain or Loss on Settlement or Curtailment (54)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 232    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 266    
Gain or Loss on Settlement or Curtailment (3)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 100    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 39    
Gain or Loss on Settlement or Curtailment (19)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 41    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 815    
Gain or Loss on Settlement or Curtailment (84)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 533    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 467    
Gain or Loss on Settlement or Curtailment (56)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 362    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 302    
Gain or Loss on Settlement or Curtailment (4)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 119    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 46    
Gain or Loss on Settlement or Curtailment (24)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 52    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Medical cost trend rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 52    
Gain or Loss on Settlement or Curtailment (26)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 56    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 267    
Gain or Loss on Settlement or Curtailment (3)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 102    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 823    
Gain or Loss on Settlement or Curtailment (85)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 565    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 465    
Gain or Loss on Settlement or Curtailment (56)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 384    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 307    
Gain or Loss on Settlement or Curtailment (3)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 124    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 51    
Gain or Loss on Settlement or Curtailment (26)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 57    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Future salary growth      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 703    
Gain or Loss on Settlement or Curtailment (81)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 430    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Future salary growth | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 390    
Gain or Loss on Settlement or Curtailment (54)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 276    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Future salary growth | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 46    
Gain or Loss on Settlement or Curtailment (24)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 52    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Medical cost trend rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 39    
Gain or Loss on Settlement or Curtailment (19)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 42    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,418    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 1,858    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 440    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 120    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,869    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,039    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 682    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 148    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Medical cost trend rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 149    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 425    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,895    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,086    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 660    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 149    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Future salary growth      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,456    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Future salary growth | Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 1,883    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Future salary growth | Seniority premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 148    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Medical cost trend rates | Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) $ 120