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Related Parties - Summary of Transactions with Related Parties (Parenthetical) (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]      
Materials purchased from subsidiaries $ 11,447,164 $ 5,312,845 $ 6,809,244
Grupo Carso, SAB de CV [member]      
Disclosure of transactions between related parties [line items]      
Network maintenance service cost 121,728 203,013 956,132
Associates [member]      
Disclosure of transactions between related parties [line items]      
Software service expense 50,730 13,490 16,161
Seguros Inbursa SA and Fianzas Guardiana Inbursa, SA [member]      
Disclosure of transactions between related parties [line items]      
Insurance premium $ 3,814,995 $ 2,713,370 $ 2,623,795