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Post-Employment and Other Non-current Employee Benefits - Summary of Amounts Recognized in Consolidated Income Statements and Consolidated Statement of Changes in Equity (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]        
Remeasurements of the Net Defined Benefit Liability net of taxes $ 747 $ 912 $ 1,240 $ 1,173
Pension and Retirement Plans        
Disclosure of defined benefit plans [line items]        
Remeasurements of the Net Defined Benefit Liability net of taxes 2,725 2,911    
Net benefit cost recognized in the consolidated statements of income        
Disclosure of defined benefit plans [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 defined benefit plans [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 defined benefit plans [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 consolidated statements of accumulated other comprehensive income        
Disclosure of defined benefit plans [line items]        
Remeasurements of the Net Defined Benefit Liability net of taxes 747 912 1,240  
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Pension and Retirement Plans        
Disclosure of defined benefit plans [line items]        
Remeasurements of the Net Defined Benefit Liability net of taxes 625 804 1,038  
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Seniority premiums        
Disclosure of defined benefit plans [line items]        
Remeasurements of the Net Defined Benefit Liability net of taxes $ 122 $ 108 $ 202