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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, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($)
--- | --- | --- | ---
Disclosure of accounts receivable [line items] |  |  |
Contractual assets | $ 34,718,749 |  |
Impairment of trade receivables | (40,798,025) |  | $ (39,044,925)
Trade and other receivables | 231,908,792 |  | 203,562,725
Non-current subscribers, distributors and contractual assets | 15,681,872 | $ 797 | 9,786,581
Total current subscribers, distributors and contractual assets | 216,226,920 | $ 10,986 | 193,776,144
Cost [member] | Receivable from subscribers and distributors [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | 173,053,226 |  | 178,722,706
Cost [member] | Telecommunications carriers for network interconnection and other services [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | 5,543,263 |  | 8,671,416
Cost [member] | Recoverable taxes [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | 46,706,298 |  | 40,477,188
Cost [member] | Sundry debtors [member] |  |  |
Disclosure of accounts receivable [line items] |  |  |
Trade and other receivables | $ 12,685,281 |  | $ 14,736,340

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