v3.25.1
Post-Employment and Other Non-current Employee Benefits - Variation in Assumptions (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability $ 1,654 $ 747 $ 912 $ 1,240
Pension and Retirement Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability 3,655 2,725    
Net benefit cost recognized in the consolidated statements of income        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 331 320 340  
Past Service Cost 132 163 53  
(Gain) or Loss on Settlement or curtailment (115) (133) (94)  
Net Interest on the Net Defined Benefit Liability 305 297 286  
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 235 233 246  
Past Service Cost 93 155 47  
(Gain) or Loss on Settlement or curtailment (107) (126) (85)  
Net Interest on the Net Defined Benefit Liability 224 222 141  
Net benefit cost recognized in the consolidated statements of income | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 96 87 94  
Past Service Cost 39 8 6  
(Gain) or Loss on Settlement or curtailment (8) (7) (9)  
Net Interest on the Net Defined Benefit Liability 81 75 145  
Net benefit cost recognized in the consolidated statements of income | Actuarial Assumption of Discount Rates        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 304 291    
Past Service Cost 133 151    
(Gain) or Loss on Settlement or curtailment (124) (124)    
Net Interest on the Net Defined Benefit Liability 263 240    
Net benefit cost recognized in the consolidated statements of income | Actuarial Assumption of Discount Rates | Pension and Retirement Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 218 211    
Past Service Cost 97 144    
(Gain) or Loss on Settlement or curtailment (117) (118)    
Net Interest on the Net Defined Benefit Liability 187 173    
Net benefit cost recognized in the consolidated statements of income | Actuarial Assumption of Discount Rates | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 86 80    
Past Service Cost 36 7    
(Gain) or Loss on Settlement or curtailment (7) (6)    
Net Interest on the Net Defined Benefit Liability 76 67    
Net benefit cost recognized in the consolidated statements of income | Actuarial Assumption of Expected Rates of Salary Increases        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 365 346    
Past Service Cost 149 180    
(Gain) or Loss on Settlement or curtailment (136) (142)    
Net Interest on the Net Defined Benefit Liability 336 331    
Net benefit cost recognized in the consolidated statements of income | Actuarial Assumption of Expected Rates of Salary Increases | Pension and Retirement Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 252 253    
Past Service Cost 108 171    
(Gain) or Loss on Settlement or curtailment (128) (134)    
Net Interest on the Net Defined Benefit Liability 250 249    
Net benefit cost recognized in the consolidated statements of income | Actuarial Assumption of Expected Rates of Salary Increases | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 113 93    
Past Service Cost 41 9    
(Gain) or Loss on Settlement or curtailment (8) (8)    
Net Interest on the Net Defined Benefit Liability 86 82    
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 1,654 747 912  
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 1,299 625 804  
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 355 122 $ 108  
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Actuarial Assumption of Discount Rates        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability 1,941 751    
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | 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 1,501 634    
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Actuarial Assumption of Discount Rates | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability 440 117    
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Actuarial Assumption of Expected Rates of Salary Increases        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability 2,163 824    
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | 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 1,677 681    
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | 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 $ 486 $ 143