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Right-of-use assets and lease 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 $ 84,259,336 $ 4,224 $ 94,702,022
2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 35,744,268    
2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 12,778,050    
2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 9,606,195    
2025 and Thereafter [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 26,130,823