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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
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