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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Aging of Accounts Receivable (Detail) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of accounts receivable [line items] |  |
Trade and other receivables | $ 215,770,817 | $ 219,845,738
Receivable from subscribers and distributors [member] | Cost [member] |  |
Disclosure of accounts receivable [line items] |  |
Trade and other receivables | 168,758,386 | 184,260,099
Receivable from subscribers and distributors [member] | 1 - 30 days [member] | Cost [member] |  |
Disclosure of accounts receivable [line items] |  |
Trade and other receivables | 37,439,995 | 46,083,644
Receivable from subscribers and distributors [member] | 31 - 60 days [member] | Cost [member] |  |
Disclosure of accounts receivable [line items] |  |
Trade and other receivables | 5,325,264 | 6,076,281
Receivable from subscribers and distributors [member] | 61 - 90 days [member] | Cost [member] |  |
Disclosure of accounts receivable [line items] |  |
Trade and other receivables | 3,313,835 | 4,121,929
Receivable from subscribers and distributors [member] | Greater than 90 days [member] | Cost [member] |  |
Disclosure of accounts receivable [line items] |  |
Trade and other receivables | 46,706,481 | 51,755,002
Unbilled services provided [member] | Receivable from subscribers and distributors [member] | Cost [member] |  |
Disclosure of accounts receivable [line items] |  |
Trade and other receivables | $ 75,972,811 | $ 76,223,243

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