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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

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