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Employee Benefits - Effect of Variation in Assumptions (Details) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Percentage of reasonably possible decrease in actuarial assumption 1.00%    
Percentage of reasonably possible increase in actuarial assumption 1.00%    
Current Service Cost $ 1,052 $ 910 $ 854
Remeasurements of the Net Defined Benefit Liability (Assets) 8,760 6,920  
Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 5,428 4,402  
Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,846 2,058  
Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 486 460  
Net benefit cost recognized in the consolidated statements of income      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 929 866 894
Gain or Loss on Settlement or Curtailment 306 278 276
Net Interest on the Net Defined Benefit Liability 587 590 508
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 505 489 534
Gain or Loss on Settlement or Curtailment 254 243 220
Net Interest on the Net Defined Benefit Liability 339 367 313
Net benefit cost recognized in the consolidated statements of income | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 394 345 328
Gain or Loss on Settlement or Curtailment 27 21 27
Net Interest on the Net Defined Benefit Liability 200 178 150
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 30 32 32
Gain or Loss on Settlement or Curtailment 25 14 29
Net Interest on the Net Defined Benefit Liability 48 $ 45 $ 45
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 1,279    
Gain or Loss on Settlement or Curtailment (298)    
Net Interest on the Net Defined Benefit Liability 506    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 771    
Gain or Loss on Settlement or Curtailment (252)    
Net Interest on the Net Defined Benefit Liability 283    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 454    
Gain or Loss on Settlement or Curtailment (25)    
Net Interest on the Net Defined Benefit Liability 185    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 54    
Gain or Loss on Settlement or Curtailment (21)    
Net Interest on the Net Defined Benefit Liability 38    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of expected rates of salary increases      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 1,386    
Gain or Loss on Settlement or Curtailment (317)    
Net Interest on the Net Defined Benefit Liability 609    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 874    
Gain or Loss on Settlement or Curtailment (289)    
Net Interest on the Net Defined Benefit Liability 404    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 512    
Gain or Loss on Settlement or Curtailment (28)    
Net Interest on the Net Defined Benefit Liability 205    
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Postretirement medical services | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 80    
Gain or Loss on Settlement or Curtailment (30)    
Net Interest on the Net Defined Benefit Liability 54    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 1,459    
Gain or Loss on Settlement or Curtailment (339)    
Net Interest on the Net Defined Benefit Liability 718    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 873    
Gain or Loss on Settlement or Curtailment (280)    
Net Interest on the Net Defined Benefit Liability 446    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 507    
Gain or Loss on Settlement or Curtailment (29)    
Net Interest on the Net Defined Benefit Liability 217    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 79    
Gain or Loss on Settlement or Curtailment (30)    
Net Interest on the Net Defined Benefit Liability 55    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of expected rates of salary increases      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 1,204    
Gain or Loss on Settlement or Curtailment (274)    
Net Interest on the Net Defined Benefit Liability 507    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 751    
Gain or Loss on Settlement or Curtailment (248)    
Net Interest on the Net Defined Benefit Liability 313    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 453    
Gain or Loss on Settlement or Curtailment (26)    
Net Interest on the Net Defined Benefit Liability 194    
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Postretirement medical services | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Current Service Cost 53    
Gain or Loss on Settlement or Curtailment (21)    
Net Interest on the Net Defined Benefit Liability 39    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,675    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,316    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 408    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) (49)    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of expected rates of salary increases      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 3,019    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,564    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 455    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Postretirement medical services | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) (76)    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,999    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,594    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates | Seniority Premiums      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 480    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) (75)    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of expected rates of salary increases      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,759    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) 2,334    
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of expected rates of salary increases | 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% | Postretirement medical services | Post-Retirement Medical Services      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liability (Assets) $ (49)