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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities $ 168,230,202 $ 152,507,058  
Net period cost (benefit)      
Net period cost (benefit) 18,085,954 16,609,565 $ 13,989,100
Mexico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 129,260,355 116,537,660  
Net period cost (benefit)      
Net period cost (benefit) 14,911,208 12,788,464 12,046,208
Puerto Rico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 14,924,874 13,228,592  
Net period cost (benefit)      
Net period cost (benefit) 664,046 747,755 686,067
Europe [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 14,392,445 12,827,318  
Net period cost (benefit)      
Net period cost (benefit) 1,701,424 2,526,957 619,039
Brazil [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 8,913,548 9,503,738  
Net period cost (benefit)      
Net period cost (benefit) 722,412 511,964 579,432
Ecuador [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 488,161 409,750  
Net period cost (benefit)      
Net period cost (benefit) 67,402 $ 34,425 $ 58,354
El Salvador [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 154,422    
Net period cost (benefit)      
Net period cost (benefit) 15,751    
Nicaragua [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 61,337    
Net period cost (benefit)      
Net period cost (benefit) 3,711    
Honduras [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities $ 35,060