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Debt - Summary of Senior Notes Outstanding (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 697,884,899 $ 707,801,403
Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 70,691,683 72,415,602
Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 14,705,772 14,070,401
Swiss francs [,ember]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 11,169,748 16,682,775
Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,282,608 2,306,643
Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 4,312,424 4,079,443
Senior Notes 1 [member] | U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 185,060,098 205,984,329
Senior Notes 1 [member] | Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 70,691,683 72,415,602
Senior Notes 1 [member] | Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 263,998,076 270,240,624
Senior Notes 1 [member] | Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 58,823,089 56,281,605
Senior Notes 1 [member] | Swiss francs [,ember]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 11,169,748 16,682,775
Senior Notes 1 [member] | Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,282,608 2,306,643
Senior Notes 1 [member] | Brazilian reals [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 20,935,142  
Senior Notes 1 [member] | Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 4,312,424 $ 4,079,443