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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