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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes and Other, Net - Summary of Analysis of Accounts Receivable by Component (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure of accounts receivable [line items]      
Less: Allowance for bad debts $ (39,044,925)   $ (37,351,677)
Net 203,562,725   216,959,399
Non-current subscribers and distributors 9,786,581 $ 495 11,184,860
Total current Subscribers, distributors, recoverable taxes and other, net 193,776,144 $ 9,793 205,774,539
Cost [member]      
Disclosure of accounts receivable [line items]      
Net 242,607,650   254,311,076
Cost [member] | Receivable from subscribers and distributors [member]      
Disclosure of accounts receivable [line items]      
Net 178,722,706   186,744,954
Cost [member] | Telecommunications carriers for network interconnection and other services [member]      
Disclosure of accounts receivable [line items]      
Net 8,671,416   9,649,849
Cost [member] | Recoverable taxes [member]      
Disclosure of accounts receivable [line items]      
Net 40,477,188   41,899,517
Cost [member] | Sundry debtors [member]      
Disclosure of accounts receivable [line items]      
Net $ 14,736,340   $ 16,016,756