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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, 2019 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 MXN ($)
--- | --- | --- | ---
Disclosure of accounts receivable [line items] |  |  |
Contract assets | $ 34,274,007 |  | $ 34,718,749
Impairment of trade receivables | (39,480,909) |  | (40,798,025)
Trade and other receivables | 219,845,738 |  | 231,908,792
Non-current subscribers, distributors and contractual assets | 15,139,442 | $ 803 | 15,681,872
Total current subscribers, distributors and contractual assets | 204,706,296 | $ 10,863 | 216,226,920
Cost [member] | Receivable from subscribers and distributors [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | 184,260,099 |  | 173,053,226
Cost [member] | Telecommunications carriers for network interconnection and other services [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | 5,079,763 |  | 5,543,263
Cost [member] | Recoverable taxes [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | 23,628,728 |  | 46,706,298
Cost [member] | Sundry debtors [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | $ 12,084,050 |  | $ 12,685,281

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