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Commitments and Contingencies - Additional Information (Detail)
R$ in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2018
BRL (R$)
Sep. 30, 2018
MXN ($)
Sep. 30, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2012
MXN ($)
Dec. 31, 2008
Disclosure of commitments and contingencies [line items]                          
Rent expense $ 34,421,817   $ 35,571,283 $ 32,300,963                  
Fine imposed on sanction procedure initiated by triggered breach 2,543,937                        
Revert of provision                 $ 13,034,562 R$ 2,566,000      
Monetary correction in a total amount of regulatory matters 19,302,937 R$ 3,800,000                      
Provision for taxes other than income tax [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision $ 1,117,538             R$ 220,000,000          
Telmex [member]                          
Disclosure of commitments and contingencies [line items]                          
Percentage of capital stock                         51.00%
Fine imposed on alleged merger         $ 14,414                
Agencia Nacional de telecomunicacoes [member]                          
Disclosure of commitments and contingencies [line items]                          
Inflation-related adjustments applicable to percentage of concessions price 60.00% 60.00%                      
ICMS related matters [member] | Provision for taxes other than income tax [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision $ 3,362,775,000             662,000,000          
CSLL and IRPJ [member] | Provision for taxes other than income tax [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 4,835,894             952,000,000          
Claro Brasil [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax assessment amount related to undue amortization of goodwill 10,906,159             2,147,000,000          
Claro Brasil [member] | Provision for taxes other than income tax [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 558,769             110,000,000          
PIS and COFINS [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax amount in dispute 5,221,952             1,028,000,000          
Tax assessments related to offset in non-cumulative method 8,183,429             1,611,000,000          
PIS and COFINS [member] | Provision for taxes other than income tax [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 5,861,997             1,154,000,000          
FUST/FUNTTEL [member] | Legal proceedings provision [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 1,706,786             336,000,000          
Brazilian ministry of communications [member] | Legal proceedings provision [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision     5,080               R$ 1,000    
ISS [member] | Legal proceedings provision [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 25,399             5,000          
Tax contingent liability [member] | ICMS related matters [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 55,455,306,000             10,917,000,000          
Tax contingent liability [member] | ICMS related matters [member] | Provision for taxes other than income tax [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 21,167,194             4,167,000,000          
Tax contingent liability [member] | Claro Brasil and Americe [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 5,861,997             1,154,000,000          
Tax contingent liability [member] | Primesys [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 3,916,464             771,000,000          
Tax contingent liability [member] | CSLL and IRPJ [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 17,779,021             3,500,000,000          
Tax contingent liability [member] | PIS and COFINS [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 16,488,772             3,246,000,000          
Tax contingent liability [member] | FUST/FUNTTEL [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 14,223,217             2,800,000,000          
Tax contingent liability [member] | Brazilian ministry of communications [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision     $ 5,115,278               R$ 1,007,000    
Tax contingent liability [member] | ISS [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision 3,637,080             716,000          
Contingent liabilities [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 12,394,517             2,440,000,000          
Contingent liabilities [member] | TFI [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax contingencies amount 13,207,273             2,600,000          
Legal proceedings contingent liability [member]                          
Disclosure of commitments and contingencies [line items]                          
Provision $ 3,419,668             R$ 673,200          
Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel) [member]                          
Disclosure of commitments and contingencies [line items]                          
Amount of fine           $ 2,724,113 $ 138,400            
Number of locations alleged for monopoly           5 5            
Mexican tax administration service [member]                          
Disclosure of commitments and contingencies [line items]                          
Consolidated tax loss           $ 0              
Mexican tax administration service [member] | Previous IFRS [member]                          
Disclosure of commitments and contingencies [line items]                          
Consolidated tax loss           8,556,000              
Mexican tax administration service [member] | Tax contingent liability [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax assessment related to tax return           $ 529,700              
Mexican tax administration service [member] | Tax contingent liability [member] | America Central Tel, S.A de C.V [member]                          
Disclosure of commitments and contingencies [line items]                          
Tax assessment for alleged tax improprieties                       $ 1,400,000