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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, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
MXN ($)
Disclosure of accounts receivable [line items]      
Contract assets $ 30,901,277   $ 29,588,104
Impairment of trade receivables (41,835,826)   (44,551,735)
Trade and other receivables 209,775,485   215,770,817
Non-current subscribers, distributors and contractual assets 6,928,888 $ 337 7,792,863
Total current subscribers, distributors and contractual assets 202,846,597 $ 9,855 207,977,954
Cost [member] | Receivable from subscribers and distributors [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables 157,433,609   168,758,386
Cost [member] | Telecommunications carriers for network interconnection and other services [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables 3,968,675   4,914,094
Cost [member] | Recoverable taxes [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables 43,734,164   44,557,402
Cost [member] | Sundry debtors [member]      
Disclosure of accounts receivable [line items]      
Trade and other receivables $ 15,573,586   $ 12,504,566