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Employee Benefits - Amounts Recognized in the Income Statement and the Statement of Comprehensive Income (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
 [1]
Dec. 31, 2024
MXN ($)
Dec. 31, 2023
MXN ($)
Dec. 31, 2022
MXN ($)
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost   $ 1,052 $ 910 $ 854
Remeasurements of the Net Defined Benefit Liability $ (49) (1,016) 160 661
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
Past Service Cost   429 322 236
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
Past Service Cost   304 288 189
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
Past Service Cost   89 21 21
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
Past Service Cost   36 13 26
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 consolidated statements of accumulated other comprehensive income        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability   2,404 1,399 1,689
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 of the Net Defined Benefit Liability   2,019 1,311 1,686
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Seniority Premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability   441 117 38
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 of the Net Defined Benefit Liability   $ (56) $ (29) $ (35)
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.4