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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Analysis of Accounts Receivable by Component (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Disclosure of accounts receivable [line items]      
Contract assets $ 29,588,104   $ 34,274,007
Impairment of trade receivables (44,551,735)   (39,480,909)
Trade and other receivables 215,770,817   219,845,738
Non-current subscribers, distributors and contractual assets 7,792,863 $ 391 15,139,442
Total current subscribers, distributors and contractual assets 207,977,954 $ 10,426 204,706,296
Cost [member] | Receivable from subscribers and distributors [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables 168,758,386   184,260,099
Cost [member] | Telecommunications carriers for network interconnection and other services [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables 4,914,094   5,079,763
Cost [member] | Recoverable taxes [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables 44,557,402   23,628,728
Cost [member] | Sundry debtors [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables $ 12,504,566   $ 12,084,050