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Employee Benefits - Analysis of Net Liability and Net Period Cost for Employee Benefit (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities $ 143,516,143 $ 137,923,317  
Net period cost (benefit)      
Net period cost (benefit) 16,971,936 15,979,152 $ 18,688,374
Mexico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 119,265,063 112,031,055  
Net period cost (benefit)      
Net period cost (benefit) 14,601,940 13,673,155 15,507,652
Puerto Rico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 7,227,422 8,859,265  
Net period cost (benefit)      
Net period cost (benefit) 170,389 538,681 548,550
Brazil [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 7,401,235 6,303,584  
Net period cost (benefit)      
Net period cost (benefit) 369,624 587,552 724,587
Europe [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 8,919,884 9,971,256  
Net period cost (benefit)      
Net period cost (benefit) 1,750,101 1,176,028 1,753,872
Ecuador [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 479,762 519,239  
Net period cost (benefit)      
Net period cost (benefit) 40,498 (29,743) 111,353
El Salvador [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 113,508 135,299  
Net period cost (benefit)      
Net period cost (benefit) 15,190 14,384 19,081
Nicaragua [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 53,974 62,327  
Net period cost (benefit)      
Net period cost (benefit) 10,937 11,502 18,561
Honduras [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 55,295 41,292  
Net period cost (benefit)      
Net period cost (benefit) $ 13,257 $ 7,593 $ 4,718