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Related Parties - Summary of Transactions with Related Parties (Parenthetical) (Detail) - MXN ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of transactions between related parties [line items]    
Materials purchased from subsidiaries $ 5,405,210 $ 7,414,728
Associated costs for towers' sale (1,584,080)  
Sale Of Towers Of Related Party Transactions 7,662,188  
Grupo Carso, SAB de CV [member]    
Disclosure of transactions between related parties [line items]    
Network maintenance service cost 48,564 79,398
Associates [member]    
Disclosure of transactions between related parties [line items]    
Software service expense 0 16,556
Radiomóvil Dipsa, S.A. de C.V. [member]    
Disclosure of transactions between related parties [line items]    
Insurance premium 2,734,425 $ 2,272,336
Dominican Republic, Paraguay, Costa Rica and Colombia [member]    
Disclosure of transactions between related parties [line items]    
Associated costs for towers' sale 789,414  
Sale Of Towers Of Related Party Transactions 2,427,897  
America Movil Peru S.A. C. [member]    
Disclosure of transactions between related parties [line items]    
Associated costs for towers' sale 779,231  
Sale Of Towers Of Related Party Transactions 4,282,291  
Telmexs [member]    
Disclosure of transactions between related parties [line items]    
Associated costs for towers' sale 15,435  
Sale Of Towers Of Related Party Transactions $ 952,000