v3.25.1
Employee Benefits, Plan Assets Invested (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Plan Assets [Abstract]      
Re-measurement value of defined pension plan $ (16,451,061) $ (15,414,937) $ (13,688,645)
Telmex's [Member]      
Plan Assets [Abstract]      
Plan assets included in net pension liability $ 159,328,024 $ 175,265,188  
Percentage of equity and debt instruments 45.80% 49.30%  
Re-measurement value of defined pension plan $ 33,858,384 $ 3,396,589  
Increase (decrease) in fair value of related party pension plan investments $ 21,428,270 $ (6,965,748)  
Puerto Rico [Member]      
Plan Assets [Abstract]      
Equity instruments 53.00% 42.00%  
Debt instruments 12.00% 23.00%  
Others 35.00% 35.00%  
Total 100.00% 100.00%  
Brazil [Member]      
Plan Assets [Abstract]      
Equity instruments 0.00% 0.00%  
Debt instruments 93.00% 91.00%  
Others 7.00% 9.00%  
Total 100.00% 100.00%  
Mexico [Member]      
Plan Assets [Abstract]      
Equity instruments 76.00% 76.00%  
Debt instruments 24.00% 24.00%  
Others 0.00% 0.00%  
Total 100.00% 100.00%