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Post-Employment and Other Non-current Employee Benefits - Variation in Assumptions (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability $ 747 $ 912 $ 1,240 $ 1,173
Pension and Retirement Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements of the Net Defined Benefit Liability 2,725 2,911    
Net benefit cost recognized in the consolidated statements of income        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 320 340 328  
Past Service Cost 163 53 0  
(Gain) or Loss on Settlement or curtailment (133) (94) 0  
Net Interest on the Net Defined Benefit Liability 297 286 248  
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 233 246 244  
Past Service Cost 155 47 0  
(Gain) or Loss on Settlement or curtailment (126) (85) 0  
Net Interest on the Net Defined Benefit Liability 222 141 197  
Net benefit cost recognized in the consolidated statements of income | Seniority premiums        
Disclosure of net defined benefit liability (asset) [line items]        
Current Service Cost 87 94 84  
Past Service Cost 8 6 0  
(Gain) or Loss on Settlement or curtailment (7) (9) 0  
Net Interest on the Net Defined Benefit Liability 75 145 51  
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 291 344    
Past Service Cost 151 175    
(Gain) or Loss on Settlement or curtailment (124) (143)    
Net Interest on the Net Defined Benefit Liability 240 346    
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 211 250    
Past Service Cost 144 167    
(Gain) or Loss on Settlement or curtailment (118) (136)    
Net Interest on the Net Defined Benefit Liability 173 261    
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 80 94    
Past Service Cost 7 8    
(Gain) or Loss on Settlement or curtailment (6) (7)    
Net Interest on the Net Defined Benefit Liability 67 85    
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 346 289    
Past Service Cost 180 146    
(Gain) or Loss on Settlement or curtailment (142) (122)    
Net Interest on the Net Defined Benefit Liability 331 256    
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 253 209    
Past Service Cost 171 139    
(Gain) or Loss on Settlement or curtailment (134) (116)    
Net Interest on the Net Defined Benefit Liability 249 187    
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 93 80    
Past Service Cost 9 7    
(Gain) or Loss on Settlement or curtailment (8) (6)    
Net Interest on the Net Defined Benefit Liability 82 69    
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 747 912 1,240  
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 625 804 1,038  
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 122 108 $ 202  
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 751 829    
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 634 692    
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 117 137    
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 824 787    
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 681 672    
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 $ 143 $ 115