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Commitments and Contingencies - Additional Information (Detail)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
MXN ($)
Dec. 31, 2014
MXN ($)
Dec. 31, 2020
BRL (R$)
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   $ 15,738,670 R$ 4,100,000        
Value Added Tax [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount $ 41,974,641         R$ 10,934,598  
Provision for taxes other than income tax [member] | Value Added Tax [Member]              
Disclosure of commitments and contingencies [line items]              
Provision 3,101,862         808,050  
Provision for taxes other than income tax [member] | Social Contribution [Member]              
Disclosure of commitments and contingencies [line items]              
Provision 3,319,251         864,681  
Provision for taxes other than income tax [member] | Social Integration Program [Member]              
Disclosure of commitments and contingencies [line items]              
Provision 4,993,865         1,300,926  
Provision for taxes other than income tax [member] | Allegedly Improper Exclusion [Member]              
Disclosure of commitments and contingencies [line items]              
Provision 1,428,756         372,198  
Provision for taxes other than income tax [member] | Alleged Underpayment Of Obligations [Member]              
Disclosure of commitments and contingencies [line items]              
Provision 656         171  
Provision for taxes other than income tax [member] | Alleged Nonpayment Of Services Tax [Member]              
Disclosure of commitments and contingencies [line items]              
Provision 46,947         12,230  
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 108,877         28,363  
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 $ 3,826,631         996,856  
Agencia Nacional de telecomunicacoes [member]              
Disclosure of commitments and contingencies [line items]              
Inflation-related adjustments applicable to percentage of concessions price 60.00%            
Related matters [member] | Provision for taxes other than income tax [member]              
Disclosure of commitments and contingencies [line items]              
Provision $ 17,643,740         4,596,280  
Tax contingent liability [member] | Social Contribution [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 20,151,371         5,249,530  
Tax contingent liability [member] | Social Integration Program [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 14,991,233         3,905,289  
Tax contingent liability [member] | Allegedly Improper Exclusion [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 11,476,895         2,989,787  
Tax contingent liability [member] | Alleged Underpayment Of Obligations [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 4,410,628         1,148,990  
Tax contingent liability [member] | Alleged Nonpayment Of Services Tax [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 1,688,790         439,938  
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 4,183,953         1,089,940  
Tax contingent liability [member] | Contribute To The Promotion Of Public Radio Broadcasting [Member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 3,848,354         1,002,515  
Tax contingent liability [member] | Related matters [member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 119,231,362         31,060,349  
Contingent liabilities [member] | TFI [member]              
Disclosure of commitments and contingencies [line items]              
Tax contingencies amount 12,921,410         3,366,090  
Provision for Monetary correction in a total amount of regulatory matters [member]              
Disclosure of commitments and contingencies [line items]              
Provision $ 2,625,671         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