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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities $ 118,325,014 $ 120,297,139  
Net period cost (benefit)      
Net period cost (benefit) 13,989,100 13,636,182 $ 14,240,271
Mexico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 85,517,190 84,821,197  
Net period cost (benefit)      
Net period cost (benefit) 12,046,208 11,586,065 12,281,154
Puerto Rico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 13,986,596 13,962,128  
Net period cost (benefit)      
Net period cost (benefit) 686,067 776,238 1,058,131
Europe [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 12,705,926 14,833,840  
Net period cost (benefit)      
Net period cost (benefit) 619,039 385,689 226,447
Brazil [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 5,666,694 6,276,780  
Net period cost (benefit)      
Net period cost (benefit) 579,432 735,855 633,159
Ecuador [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 448,608 403,194  
Net period cost (benefit)      
Net period cost (benefit) $ 58,354 $ 152,335 $ 41,380