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Commitments and Contingencies - Additional Information (Detail) R$ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2014 MXN ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2018 BRL (R$) | Sep. 30, 2018 MXN ($) | Sep. 30, 2018 BRL (R$) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2012 MXN ($) | Dec. 31, 2008
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rent expense | $ 34,421,817 |  | $ 35,571,283 | $ 32,300,963 |  |  |  |  |  |  |  |  |
Fine imposed on sanction procedure initiated by triggered breach | 2,543,937 |  |  |  |  |  |  |  |  |  |  |  |
Revert of provision |  |  |  |  |  |  |  |  | $ 13,034,562 | R$ 2,566,000 |  |  |
Monetary correction in a total amount of regulatory matters | 19,302,937 | R$ 3,800,000 |  |  |  |  |  |  |  |  |  |  |
Provision for taxes other than income tax [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | $ 1,117,538 |  |  |  |  |  |  | R$ 220,000,000 |  |  |  |  |
Telmex [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of capital stock |  |  |  |  |  |  |  |  |  |  |  |  | 51.00%
Fine imposed on alleged merger |  |  |  |  | $ 14,414 |  |  |  |  |  |  |  |
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 | $ 3,362,775,000 |  |  |  |  |  |  | 662,000,000 |  |  |  |  |
CSLL and IRPJ [member] | Provision for taxes other than income tax [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 4,835,894 |  |  |  |  |  |  | 952,000,000 |  |  |  |  |
Claro Brasil [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax assessment amount related to undue amortization of goodwill | 10,906,159 |  |  |  |  |  |  | 2,147,000,000 |  |  |  |  |
Claro Brasil [member] | Provision for taxes other than income tax [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 558,769 |  |  |  |  |  |  | 110,000,000 |  |  |  |  |
PIS and COFINS [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax amount in dispute | 5,221,952 |  |  |  |  |  |  | 1,028,000,000 |  |  |  |  |
Tax assessments related to offset in non-cumulative method | 8,183,429 |  |  |  |  |  |  | 1,611,000,000 |  |  |  |  |
PIS and COFINS [member] | Provision for taxes other than income tax [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 5,861,997 |  |  |  |  |  |  | 1,154,000,000 |  |  |  |  |
FUST/FUNTTEL [member] | Legal proceedings provision [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 1,706,786 |  |  |  |  |  |  | 336,000,000 |  |  |  |  |
Brazilian ministry of communications [member] | Legal proceedings provision [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision |  |  | 5,080 |  |  |  |  |  |  |  | R$ 1,000 |  |
ISS [member] | Legal proceedings provision [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 25,399 |  |  |  |  |  |  | 5,000 |  |  |  |  |
Tax contingent liability [member] | ICMS related matters [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 55,455,306,000 |  |  |  |  |  |  | 10,917,000,000 |  |  |  |  |
Tax contingent liability [member] | ICMS related matters [member] | Provision for taxes other than income tax [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 21,167,194 |  |  |  |  |  |  | 4,167,000,000 |  |  |  |  |
Tax contingent liability [member] | Claro Brasil and Americe [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 5,861,997 |  |  |  |  |  |  | 1,154,000,000 |  |  |  |  |
Tax contingent liability [member] | Primesys [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 3,916,464 |  |  |  |  |  |  | 771,000,000 |  |  |  |  |
Tax contingent liability [member] | CSLL and IRPJ [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 17,779,021 |  |  |  |  |  |  | 3,500,000,000 |  |  |  |  |
Tax contingent liability [member] | PIS and COFINS [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 16,488,772 |  |  |  |  |  |  | 3,246,000,000 |  |  |  |  |
Tax contingent liability [member] | FUST/FUNTTEL [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 14,223,217 |  |  |  |  |  |  | 2,800,000,000 |  |  |  |  |
Tax contingent liability [member] | Brazilian ministry of communications [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision |  |  | $ 5,115,278 |  |  |  |  |  |  |  | R$ 1,007,000 |  |
Tax contingent liability [member] | ISS [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | 3,637,080 |  |  |  |  |  |  | 716,000 |  |  |  |  |
Contingent liabilities [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 12,394,517 |  |  |  |  |  |  | 2,440,000,000 |  |  |  |  |
Contingent liabilities [member] | TFI [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingencies amount | 13,207,273 |  |  |  |  |  |  | 2,600,000 |  |  |  |  |
Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision | $ 3,419,668 |  |  |  |  |  |  | R$ 673,200 |  |  |  |  |
Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel) [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of fine |  |  |  |  |  | $ 2,724,113 | $ 138,400 |  |  |  |  |  |
Number of locations alleged for monopoly |  |  |  |  |  | 5 | 5 |  |  |  |  |  |
Mexican tax administration service [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated tax loss |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
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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