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Debt - Summary of Long Term Debt Maturities (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 542,691,819 $ 27,572 $ 646,139,058
2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 121,184,630    
2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 54,189,122    
2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 88,027,828    
2023 and Thereafter [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 279,290,239