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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