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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Accounts Receivable From Subscribers and Distributors Included in Impairments of Trade Receivables (Detail) - Receivable from subscribers and distributors [member] - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of accounts receivable [line items]
Allowance for bad debts	$ 44,551,735	$ 39,480,909
1 - 90 days [member]
Disclosure of accounts receivable [line items]
Allowance for bad debts	4,455,174	3,948,091
Greater than 90 days [member]
Disclosure of accounts receivable [line items]
Allowance for bad debts	$ 40,096,561	$ 35,532,818