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Debt - Summary of Senior Notes Outstanding (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 628,382,956 $ 624,254,477
U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 186,531,417 169,142,643
Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 51,282,881 58,129,292
Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 224,928,934 222,190,375
Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 59,993,720 54,962,779
Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,511,701 2,255,663
Brazilian reais [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 32,533,191 34,948,736
Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 4,078,453 3,562,695
Senior Notes 1 [member] | U.S. dollars [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 186,531,417 169,142,643
Senior Notes 1 [member] | Mexican pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 51,282,881 58,129,292
Senior Notes 1 [member] | Euros [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 183,988,456 222,190,375
Senior Notes 1 [member] | Pound sterling [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 59,993,720 54,962,779
Senior Notes 1 [member] | Japanese yens [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 2,511,701 2,255,663
Senior Notes 1 [member] | Brazilian reais [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings 32,533,191 34,948,736
Senior Notes 1 [member] | Chilean pesos [member]    
Disclosure of Senior Notes Outstanding [Line Items]    
Borrowings $ 4,078,453 $ 3,562,695