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Employee Benefits - Additional Information (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]        
Current service cost $ 2,090,896 $ 2,810,584 $ 2,591,975  
Expected return on plan assets 15,112,669 17,655,119 20,070,037  
Net pension plan liability and plan assets (131,410,989) (154,847,297) (140,696,974) $ (108,118,868)
Defined contribution plan, payment $ (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) $ 18,688,374 $ 18,085,954 16,609,565  
Akenes [member]        
Disclosure of defined benefit plans [line items]        
Defined Benefit Plan, Pension Benefit Obligation, Percentage 24.00% 20.00%    
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 $ 286,195 $ 295,567    
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 $ 177,270,561 $ 150,090,481    
Rate of equity instruments   36.90%    
Rate of debt instruments 47.50%      
Recorded of pension plan re-measurement value in defined pension plan   $ (9,928,728) $ 11,753,416  
Increase in fair value of related party pension plan investments $ 20,234,095 14,820,220    
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 $ 1,436,587 1,474,721    
Contributions to the government, net of the share contributed by civil servants 601,626 601,476    
Austria [member] | Defined Contribution Plans [member]        
Disclosure of defined benefit plans [line items]        
DCP liability 114,233 134,034    
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 $ 68,425 66,294    
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 29.00%      
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 $ 225,984 268,562 $ 99,498  
Employee benefits 1,380,764 2,111,801    
Cost of labor 61,649 2,930 3,365  
Net period cost (benefit) 724,587 722,412 511,964  
Employee benefits 1,380,764 2,111,801    
Brazil [member] | Claro Brasil [member] | Defined Contribution Plans [member]        
Disclosure of defined benefit plans [line items]        
DCP liability $ 274,630 980,014    
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]        
Current service cost     49,050  
Expected return on plan assets $ 267,728 174,994    
Employee benefits 1,099,732 916,534    
Net period cost (benefit) 15,507,652 14,911,208 12,788,464  
Ecuador [member]        
Disclosure of defined benefit plans [line items]        
Current service cost 111,353 67,402 34,425  
Employee benefits 601,239 488,161    
Net period cost (benefit) 111,353 67,402 $ 34,425  
Employee benefits 601,239 488,161    
Central America [Member]        
Disclosure of defined benefit plans [line items]        
Employee benefits 285,223 250,819    
Net period cost (benefit) 42,360 19,462    
Employee benefits $ 285,223 $ 250,819