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Debt - Summary of Senior Notes Outstanding (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 624,254,477 $ 638,922,453
U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 169,142,643 184,089,282
Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 58,129,292 68,001,125
Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 222,190,375 236,548,891
Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 54,962,779 55,223,526
Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,255,663 2,334,864
Brazilian reais [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 34,948,736 32,891,187
Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 3,562,695 3,904,707
Senior Notes 1 [member] | U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 169,142,643 184,089,282
Senior Notes 1 [member] | Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 58,129,292 68,001,125
Senior Notes 1 [member] | Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 222,190,375 236,548,891
Senior Notes 1 [member] | Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 54,962,779 55,223,526
Senior Notes 1 [member] | Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,255,663 2,334,864
Senior Notes 1 [member] | Brazilian reais [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 34,948,736 32,891,187
Senior Notes 1 [member] | Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 3,562,695 $ 3,904,707