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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities $ 120,297,139 $ 111,048,867  
Net period cost (benefit)      
Net period cost (benefit) 13,636,182 14,240,271 $ 9,278,081
Mexico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 84,821,197 70,073,351  
Net period cost (benefit)      
Net period cost (benefit) 11,586,065 12,281,154 8,962,953
Puerto Rico [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 13,962,128 17,736,616  
Net period cost (benefit)      
Net period cost (benefit) 776,238 1,058,131 (455,117)
Brazil [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 6,276,780 7,222,762  
Net period cost (benefit)      
Net period cost (benefit) 735,855 633,159 451,353
Europe [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 14,833,840 15,748,433  
Ecuador [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Liabilities 403,194 267,705  
Net period cost (benefit)      
Net period cost (benefit) 152,335 41,380 58,042
Austria [member]      
Net period cost (benefit)      
Net period cost (benefit) $ 385,689 $ 226,447 $ 260,850