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Debt - Summary of Long Term Debt Maturities (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 480,299,772 $ 24,077 $ 495,082,444
2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 112,091,112    
2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 25,594,561    
2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 31,721,298    
2025 and Thereafter [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 310,892,801