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Employee Benefits - Additional Information (Detail) - MXN ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2020
Disclosure of defined benefit plans [line items] |  |  |  |  |
Expected return on plan assets | $ 20,251,931 | $ 18,819,322 | $ 15,112,669 |  |
Net pension plan liability and plan assets | (134,420,606) | (128,400,391) | (131,410,989) |  | $ (154,847,297)
Defined contribution plan, payment | $ (297,159) | (281,579) | (225,876) |  |
Severance benefit obligations, description | Severance benefit obligations for employees, whose employment commenced before January 1, 2003, excluding civil servants, are covered by defined benefit plans. Upon termination of employment by A1 Telekom Austria Group or upon retirement, eligible employees receive severance payments. Depending on their time in service, their severance amounts to a multiple of their monthly basic compensation plus variable components such as overtime or bonuses, up to a maximum of twelve monthly salaries. In case of death, the heirs of eligible employees receive 50% of the severance benefits. The primary risks to A1 Telekom Austria Group are salary increases and changes of interest rates. |  |  |  |
Severance benefits, in case of death | 50.00% |  |  |  |
Net period cost (benefit) | $ 16,971,936 | 15,979,152 | 18,688,374 |  |
Telekom Austria [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Defined benefits plan, eligibility retirement date | Jan. 01, 1975 |  |  |  |
Telekom Austria [member] | Defined Contribution Plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Annual expense of defined contribution plan | $ 199,345 | 252,980 |  |  |
Telekom Austria [member] | Unfunded Pension Plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Plan description | Part of the Telmex´s employees are covered under defined benefit pension plans and seniority premiums. Pension benefits and seniority premiums are determined on the basis in their final year of employment, their seniority, and their age at the time of retirement. Telmex has set up an irrevocable trust fund to finance these employee benefits and has adopted the policy of making contributions to such fund when it is considered necessary. |  |  |  |
Benefit determination maximum percentage on salary before retirement | 80.00% |  |  |  |
Telmexs [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Net pension plan liability and plan assets | $ 175,265,188 | $ 174,814,669 |  |  |
Rate of equity instruments |  | 44.20% |  |  |
Rate of debt instruments | 49.30% |  |  |  |
Recorded of pension plan re-measurement value in defined pension plan | $ 3,396,589 | $ 11,590,623 |  |  |
Increase in fair value of related party pension plan investments | $ (6,965,748) | 9,806,143 |  |  |
Top of range [member] | Telekom Austria [member] | Defined Contribution Plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Percentage of defined contribution plan | 5.00% |  |  |  |
Austria [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Service award description | Civil servants and certain employees (in the following “employees”) are eligible to receive service awards. In accordance with the legal regulations, eligible employees receive a cash bonus of two months’ salary after 25 years of service and four months’ salary after 40 years of service. Employees with at least 35 years of service when retiring (at the age of 65) or who are retiring based on specific legal regulations are also eligible to receive the service award of four monthly salaries. The obligation is accrued over the period of service, taking into account the employee turnover rate for employees who leave employment prematurely. The main risk that A1 Telekom Austria Group is exposed to is the risk of development of salary increases and changes of interest rates. |  |  |  |
Service period to receive bonus, description | after 25 years |  |  |  |
Service period to receive bonus, description | after 40 years |  |  |  |
Contributions to social security, net of the share contributed by civil servants | $ 1,105,037 | 1,272,331 |  |  |
Contributions to the government, net of the share contributed by civil servants | 560,777 | 597,710 |  |  |
Austria [member] | Defined Contribution Plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
DCP liability | 56,692 | 55,937 |  |  |
Austria [member] | Telekom Austria [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Percentage of contribution to social security |  |  |  | 12.55% |
Austria [member] | Telekom Austria [member] | Defined Contribution Plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Defined contribution plan, payment | $ 74,994 | 66,700 |  |  |
Austria [member] | Bottom of range [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Service period to receive bonus, description | 35 years of service when retiring (at the age of 65) |  |  |  |
Percentage of contribution to active civil servants | 28.00% |  |  |  |
Austria [member] | Top of range [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Percentage of contribution to active civil servants | 7.00% |  |  |  |
Brazil [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Current service cost | $ 82,870 | 166,503 | 225,984 |  |
Employee benefits | 1,790,094 | 1,428,547 |  |  |
Cost of labor | 3,846 | 5,021 | 61,649 |  |
Net period cost (benefit) | 369,624 | 587,552 | 724,587 |  |
Brazil [member] | Claro Brasil [member] | Defined Contribution Plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
DCP liability | $ 320,904 | 34,775 |  |  |
Brazil [member] | Bottom of range [member] | Claro Brasil [member] | Participants enrolled before October 31st, 2014 [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employee contributions to the plan | 1.00% |  |  |  |
Brazil [member] | Bottom of range [member] | Claro Brasil [member] | Participants enrolled after October 31st, 2014 [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employee contributions to the plan | 1.00% |  |  |  |
Brazil [member] | Top of range [member] | Claro Brasil [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employer contributions to the plan | 8.00% |  |  |  |
Brazil [member] | Top of range [member] | Claro Brasil [member] | Participants enrolled before October 31st, 2014 [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employee contributions to the plan | 8.00% |  |  |  |
Brazil [member] | Top of range [member] | Claro Brasil [member] | Participants enrolled after October 31st, 2014 [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employee contributions to the plan | 7.00% |  |  |  |
Mexico [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Expected return on plan assets | $ 120,843 | 126,735 | 267,728 |  |
Employee benefits | 978,851 | 1,070,177 |  |  |
Net period cost (benefit) | 14,601,940 | 13,673,155 | 15,507,652 |  |
Ecuador [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Current service cost | 40,498 | (29,743) | 111,353 |  |
Employee benefits | 479,762 | 519,239 |  |  |
Net period cost (benefit) | 40,498 | (29,743) | $ 111,353 |  |
Central America [Member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employee benefits | 222,777 | 238,918 |  |  |
Net period cost (benefit) | $ 39,384 | $ 33,479 |  |  |

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