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Debt - Summary of Senior Notes Outstanding (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 638,922,453 $ 697,884,899
U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 184,089,282 185,060,098
Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 68,001,125 70,691,683
Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 236,548,891 263,998,076
Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 55,223,526 58,823,089
Swiss francs [,ember]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings   11,169,748
Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,334,864 2,282,608
Brazilian reals [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 32,891,187 20,935,142
Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 3,904,707 4,312,424
Senior Notes 1 [member] | U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 184,089,282 185,060,098
Senior Notes 1 [member] | Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 68,001,125 70,691,683
Senior Notes 1 [member] | Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 236,548,891 263,998,076
Senior Notes 1 [member] | Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 55,223,526 58,823,089
Senior Notes 1 [member] | Swiss francs [,ember]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings   11,169,748
Senior Notes 1 [member] | Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,334,864 2,282,608
Senior Notes 1 [member] | Brazilian reals [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 32,891,187 20,935,142
Senior Notes 1 [member] | Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 3,904,707 $ 4,312,424