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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, 2018
Dec. 31, 2017
Disclosure of accounts receivable [line items]    
Trade and other receivables $ 231,908,792 $ 203,562,725
Receivable from subscribers and distributors [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 173,053,226 178,722,706
Receivable from subscribers and distributors [member] | 1 - 30 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 46,816,302 46,758,825
Receivable from subscribers and distributors [member] | 31 - 60 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 6,315,277 6,780,671
Receivable from subscribers and distributors [member] | 61 - 90 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 4,168,952 4,375,188
Receivable from subscribers and distributors [member] | Greater than 90 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 53,129,041 42,423,848
Unbilled services provided [member] | Receivable from subscribers and distributors [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables $ 62,623,654 $ 78,384,174