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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

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