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Debt - Summary of Long Term Debt Maturities (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 495,082,444 $ 26,271 $ 542,691,819
2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 63,552,328    
2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 98,645,036    
2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 22,193,586    
2024 and Thereafter [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 310,691,494