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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands, € in Millions, R$ in Millions, $ in Billions
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 18, 2018
MXN ($)
Jan. 18, 2018
BRL (R$)
Feb. 14, 2014
MXN ($)
Feb. 14, 2014
USD ($)
Jan. 31, 2018
MXN ($)
Jan. 31, 2018
BRL (R$)
Aug. 31, 2016
MXN ($)
Aug. 31, 2016
USD ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2015
BRL (R$)
May 31, 2015
MXN ($)
May 31, 2015
USD ($)
Jan. 31, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2015
BRL (R$)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2015
MXN ($)
Jan. 18, 2018
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
EUR (€)
Jul. 31, 2017
MXN ($)
Jul. 31, 2017
COP ($)
Dec. 31, 2016
BRL (R$)
Aug. 31, 2016
USD ($)
Dec. 31, 2015
BRL (R$)
Dec. 31, 2012
MXN ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2012
MXN ($)
Nov. 30, 2008
Disclosure of commitments and contingencies [line items]                                                                        
Rent expense                                 $ 35,571,283,000       $ 32,300,963,000   $ 22,015,761,000                          
Commitments for acquisition of equipment                                 13,186,926,000               $ 666,454                      
Monetary correction in a total amount of regulatory matters         $ 20,336,995,000 R$ 3,400.0                                                            
Amount of fine     $ 2,738,479,000 $ 138,400                                                                
Arbitration proceeding payment                                                       $ 18,547,629,000 $ 3,155              
Number of loactions alleged for monopoly     5 5                                                                
Percent of fine posted as guarantee     50.00% 50.00%                                                                
Additional income tax in connection with amortization of brand name and customer base                                 581,971,000     € 24.5                                
Mobile termination provision [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 494,488,000                                      
Provision for taxes other than income tax [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 5,084,249,000                 R$ 850.0                    
Third Party Disputes [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 2,350,717,000                 393.0                    
Third-party disputes, aggregate claim amount                                 25,307,596,000   R$ 4,231.0                                  
Claro Brasil [member] | Civil [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                         939,091,000                 R$ 157.0            
Claims                                         29,458,736,000 R$ 4,925.0                            
Claro Brasil [member] | Environmental [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 65,796,000                 11.0                    
Claims                                 4,019,547,000   672.0                                  
Claro Brasil [member] | Labor [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 2,667,735,000                 446.0                    
Claims                                 53,952,852,000   R$ 9,020.0                                  
Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel) [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Amount of fine             $ 1,622,509,000 $ 82,000                                                        
Tax contingencies amount                                                                 $ 2,354,617,000 $ 119,000    
Income taxes paid                     $ 1,278,221,000 $ 64,600         892,499,000 $ 45,106                                    
Fine posted as guarantee             817,191,000                                               $ 41,300          
Telmex [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Percentage of capital stock                                                                       51.00%
Fine imposed on alleged merger                         $ 14,414,000                                              
ICMS related matters [member] | Provision for taxes other than income tax [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 3,541,030,000                 592.0                    
CSLL and IRPJ [member] | Provision for taxes other than income tax [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 3,158,216,000                 528.0                    
Claro Brasil [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax assessment amount related to undue amortization of goodwill                                 12,728,566,000                 2,128.0                    
PIS and COFINS [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax amount in dispute                                 20,636,069,000                 3,450.0                    
Tax assessments related to offset in non-cumulative method                                 9,426,795,000                 1,576.0                    
PIS and COFINS [member] | Provision for taxes other than income tax [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 20,743,735,000                 3,468.0                    
FUST/FUNTTEL [member] | Legal proceedings provision [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 11,963,000                 2.0                    
Brazilian ministry of communications [member] | Legal proceedings provision [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                         5,981,000                 1.0            
ISS [member] | Legal proceedings provision [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 $ 29,907,000                 5.0                    
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% 60.00% 60.00%                                
Agencia Nacional de telecomunicacoes [member] | Claro Brasil [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 $ 645,999,000                 108.0                    
Other regulatory disputes, aggregate amount                                 $ 12,267,993,000   R$ 2,051.0                                  
Agencia Nacional de telecomunicacoes [member] | Claro Brasil [member] | Reversible assets [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Amount of fine                 $ 59,815,000 R$ 10.0         $ 59,815,000 R$ 10.0                                        
Deposits in an escrow account                 $ 5,203,878,000           $ 5,203,878,000               $ 5,203,878,000                 R$ 870.0        
Description of imposed the obligations                                 To make a deposit within 180 days of approximately Ps.5,203,878 (R$870 million) in an escrow account to buy other assets which would be subject to reversion and thereby replace the assets removed. However, if the assets were replaced, Claro Brasil may instead deposit the difference between their sale price and the price of assets purchase to replace them. According to Anatel, such amount represents the value of the assets that were being allegedly removed from the assets list reported to Anatel without a justification for the alleged removal.Within 180 days following Anatel’s decision, the inclusion in all agreements executed after the Reversible Assets Regulation (Regulamento de Bens Reversíveis) came into effect, of mandatory provisions related, among others, to the indispensability of those assets for the provision of the services under the concessions, Anatel’s subrogation rights under those agreements and the obligation of their counterparty not to encumber the assets used by Claro Brasil thereunder. To make a deposit within 180 days of approximately Ps.5,203,878 (R$870 million) in an escrow account to buy other assets which would be subject to reversion and thereby replace the assets removed. However, if the assets were replaced, Claro Brasil may instead deposit the difference between their sale price and the price of assets purchase to replace them. According to Anatel, such amount represents the value of the assets that were being allegedly removed from the assets list reported to Anatel without a justification for the alleged removal.Within 180 days following Anatel’s decision, the inclusion in all agreements executed after the Reversible Assets Regulation (Regulamento de Bens Reversíveis) came into effect, of mandatory provisions related, among others, to the indispensability of those assets for the provision of the services under the concessions, Anatel’s subrogation rights under those agreements and the obligation of their counterparty not to encumber the assets used by Claro Brasil thereunder. To make a deposit within 180 days of approximately Ps.5,203,878 (R$870 million) in an escrow account to buy other assets which would be subject to reversion and thereby replace the assets removed. However, if the assets were replaced, Claro Brasil may instead deposit the difference between their sale price and the price of assets purchase to replace them. According to Anatel, such amount represents the value of the assets that were being allegedly removed from the assets list reported to Anatel without a justification for the alleged removal.Within 180 days following Anatel’s decision, the inclusion in all agreements executed after the Reversible Assets Regulation (Regulamento de Bens Reversíveis) came into effect, of mandatory provisions related, among others, to the indispensability of those assets for the provision of the services under the concessions, Anatel’s subrogation rights under those agreements and the obligation of their counterparty not to encumber the assets used by Claro Brasil thereunder. To make a deposit within 180 days of approximately Ps.5,203,878 (R$870 million) in an escrow account to buy other assets which would be subject to reversion and thereby replace the assets removed. However, if the assets were replaced, Claro Brasil may instead deposit the difference between their sale price and the price of assets purchase to replace them. According to Anatel, such amount represents the value of the assets that were being allegedly removed from the assets list reported to Anatel without a justification for the alleged removal.Within 180 days following Anatel’s decision, the inclusion in all agreements executed after the Reversible Assets Regulation (Regulamento de Bens Reversíveis) came into effect, of mandatory provisions related, among others, to the indispensability of those assets for the provision of the services under the concessions, Anatel’s subrogation rights under those agreements and the obligation of their counterparty not to encumber the assets used by Claro Brasil thereunder.                                
Agencia Nacional de telecomunicacoes [member] | Claro Brasil [member] | New decision to eliminate obligation [member] | Reversible assets [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Amount of fine $ 14,954,000 R$ 2.5                                                                    
Deposits in an escrow account $ 5,203,878,000                                             R$ 870.0                        
Mobiltel EAD [member] | Tax assessment one [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 $ 539,214,000                   € 22.7                  
Mobiltel EAD [member] | Tax assessment three [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 1,482,245,000                   62.4                  
Bank guarantees to secure the tax liability                                 1,496,498,000                   € 63.0                  
Tax contingent liability [member] | Star one [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 23,668,673,000                 3,957.0                    
Tax contingent liability [member] | ICMS related matters [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 64,749,404,000                 10,825.0                    
Tax contingent liability [member] | Claro Brasil and Americe [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 7,363,189,000                 1,231.0                    
Tax contingent liability [member] | Primesys [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 4,510,028,000                 754.0                    
Tax contingent liability [member] | CSLL and IRPJ [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 20,929,161,000                 3,499.0                    
Tax contingent liability [member] | PIS and COFINS [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 32,999,765,000                 5,517.0                    
Tax contingent liability [member] | FUST/FUNTTEL [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 17,107,002,000                 2,860.0                    
Tax contingent liability [member] | Brazilian ministry of communications [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                         $ 5,736,229,000                 R$ 959.0            
Tax contingent liability [member] | ISS [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 3,535,048,000                 591.0                    
Contingent liabilities [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 12,620,900,000                 2,110.0                    
Contingent liabilities [member] | TFI [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax contingencies amount                                 13,793,268,000                 2,306.0                    
Legal proceedings contingent liability [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Provision                                 3,983,658,000                 R$ 666.0                    
Mexican tax administration service [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Consolidated tax loss                           $ 0                                            
Mexican tax administration service [member] | Previously stated [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Consolidated tax loss                           8,556,000,000                                            
Mexican tax administration service [member] | Tax contingent liability [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax assessment related to tax return                           $ 529,700,000                                            
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             $ 1,244,000,000                                                          
Mexican tax administration service [member] | Tax contingent liability [member] | Sercotel [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Tax assessment for alleged tax improprieties                                                                     $ 1,400,000,000  
Purchase commitment for resale of cellular phones [member] | Telephone manufacturers [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Purchase commitments with telephone manufacturers for resale cellular phones                                 $ 12,307,327,000               $ 622,000                      
Telephone plant with switching transmission [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Completion period for projects under construction                                 6 months 6 months 6 months 6 months                                
Telephone Plant Other Than Switching Transmission [member]                                                                        
Disclosure of commitments and contingencies [line items]                                                                        
Completion period for projects under construction                                 2 years 2 years 2 years 2 years