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Commitments and Contingencies - Additional Information (Detail)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
MXN ($)
Dec. 31, 2014
MXN ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2012
MXN ($)
Disclosure of commitments and contingencies [line items]            
Fine imposed on sanction procedure initiated by triggered breach     $ 2,543,937      
Monetary correction in a total amount of regulatory matters $ 19,169,206 R$ 4,100,000        
Value Added Tax [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 53,252,990       R$ 11,390,000  
Provision for taxes other than income tax [member] | Value Added Tax [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 3,515,913       752,000  
Provision for taxes other than income tax [member] | Social Contribution [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 4,072,287       871,000  
Provision for taxes other than income tax [member] | Social Integration Program [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 5,825,569       1,246,000  
Provision for taxes other than income tax [member] | Allegedly Improper Exclusion [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 1,613,019       345,000  
Provision for taxes other than income tax [member] | Alleged Underpayment Of Obligations [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 1,384       296  
Provision for taxes other than income tax [member] | Alleged Nonpayment Of Services Tax [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 14,026       3,000  
Provision for taxes other than income tax [member] | Alleged Underpayment Of IRRF and CIDE Taxes And Remittances To Foreign Operators [Member]            
Disclosure of commitments and contingencies [line items]            
Provision 98,184       21,000  
Provision for taxes other than income tax [member] | Contribute To The Promotion Of Public Radio Broadcasting [Member]            
Disclosure of commitments and contingencies [line items]            
Provision $ 4,574,745       978,468  
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 $ 20,637,287       4,414,000  
Tax contingent liability [member] | Social Contribution [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 18,182,694       3,889,000  
Tax contingent liability [member] | Social Integration Program [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 18,084,510       3,868,000  
Tax contingent liability [member] | Allegedly Improper Exclusion [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 16,265,773       3,479,000  
Tax contingent liability [member] | Alleged Underpayment Of Obligations [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 4,937,239       1,056,000  
Tax contingent liability [member] | Alleged Nonpayment Of Services Tax [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 1,954,324       418,000  
Tax contingent liability [member] | Alleged Underpayment Of IRRF and CIDE Taxes And Remittances To Foreign Operators [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 3,356,949       718,000  
Tax contingent liability [member] | Contribute To The Promotion Of Public Radio Broadcasting [Member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 4,599,207       983,700  
Tax contingent liability [member] | ICMS related matters [member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 137,382,429       29,384,000  
Contingent liabilities [member] | TFI [member]            
Disclosure of commitments and contingencies [line items]            
Tax contingencies amount 12,675,053       2,711,000  
Legal proceedings contingent liability [member]            
Disclosure of commitments and contingencies [line items]            
Provision $ 3,197,985       R$ 684,000  
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