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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

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