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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2025
Employee Benefits [Abstract]  
Net Liability and Net Period Cost for Employee Benefits
An analysis of the net liability and net period cost for employee benefits is as follows:

   
At December 31,
  
   
2024
    
2025
  
Mexico
  
Ps.
145,277,743    
Ps.
185,512,908  
Puerto Rico
    
6,954,741
      
4,446,433
  
Brazil
    
5,411,258
      
4,586,624
  
Europe
    
8,578,927
      
7,921,323
  
Ecuador
    
654,465
      
646,490
  
El Salvador
    
165,653
      
167,556
  
Nicaragua
    
71,266
      
74,063
  
Honduras
    
38,388
      
31,287
  
Total
  
Ps.
167,152,441    
Ps.
203,386,684  

   
For the year ended December 31,
  
   
2023
  
2024
    
2025
  
Mexico
   Ps.
 14,601,940     Ps.
 16,074,164     Ps.
 18,469,482  
Puerto Rico
    
170,389
      
535,051
      
508,862
  
Brazil
    
369,624
      
(228,547
)
    
165,103
  
Europe
    
1,750,101
      
1,755,407
      
2,190,588
  
Ecuador
    
40,498
      
65,123
      
71,135
  
El Salvador
    
15,190
      
16,430
      
20,332
  
Nicaragua
    
10,937
      
13,387
      
13,092
  
Honduras
    
13,257
      
1,527
      
6,288
  
Total
   Ps.
 16,971,936     Ps.
 18,232,542     Ps.
 21,444,882  
Defined Benefit Obligation (DBO) and Plan Assets for the Pension and Other Benefit Obligation Plans
The defined benefit obligation (DBO) and plan assets for the pension and other benefit obligation plans, by country, are as follows:
 

  
At December 31
  

 
2024
    
2025
  
               
Effect of asset
    
Net employee
                
Effect of asset
    
Net employee
  
   
DBO
    
Plan Assets
    
ceiling
    
benefit liability
    
DBO
    
Plan Assets
    
ceiling
    
benefit liability
  
Mexico          
   Ps.
303,027,238     Ps.
(159,328,024 )   Ps.
—     Ps.
143,699,214
     Ps.
343,620,613
     Ps.
(160,323,036 )   Ps.
—
      Ps. 183,297,577  
Puerto Rico          
    
24,608,173
      
(17,653,432
)
    
—
      
6,954,741
      
21,444,857
      
(16,998,424
)
    
—
      
4,446,433
  
Brazil          
    
12,113,660
      
(13,054,352
)
    
4,481,044
      
3,540,352
      
12,498,399
      
(12,834,952
)
    
3,980,671
      
3,644,118
  
Europe          
    
3,379,389
      
—
      
—
      
3,379,389
      
3,065,854
      
—
      
—
      
3,065,854
  
Total          
   Ps.
343,128,460     Ps.
(190,035,808 )   Ps.
4,481,044     Ps.
157,573,696     Ps. 380,629,723     Ps.
(190,156,412 )   Ps.
3,980,671     Ps.
194,453,982  
Actuarial Results Generated for Pension and Retirement Plans as well as the Medical Services
Below is a summary of the actuarial results generated for the pension and retirement plans as well as the medical services in Puerto Rico and Brazil; the pension plans and seniority premiums related to Telmex; the pension plan, the service awards plan and severance in Austria corresponding to the years ended December 31, 2023, 2024 and 2025:
 
   
At December 31, 2023
  
   
DBO
    
Plan Assets
    
Effect of asset
ceiling
    
Net employee
benefit liability
  
Balance at the beginning of the year
   Ps. 330,862,941     Ps. (208,526,619 )   Ps. 6,064,069     Ps. 128,400,391  
Current service cost
    
2,044,102
      
—
      
—
      
2,044,102
  
Interest cost on projected benefit obligation
    
33,203,706
      
—
      
—
      
33,203,706
  
Expected return on plan assets
    
—
      
(20,251,931
)
    
—
      
(20,251,931
)
Changes in the asset ceiling during the period and others
    
—
      
—
      
585,667
      
585,667
  
Past service costs and other
    
(322,700
)
    
145,646
      
—
      
(177,054
)
Actuarial gain for changes in experience
    
(20,645
)
    
—
      
—
      
(20,645
)
Actuarial gain from changes in demographic assumptions
    
134
      
—
      
—
      
134
  
Actuarial gain from changes in financial assumptions
  
30,958
    
—
    
—
    
30,958
  
Net period cost
   Ps. 34,935,555     Ps. (20,106,285 )   Ps. 585,667     Ps. 15,414,937  
Actuarial loss for changes in experience
    
10,632,144
      
—
      
—
      
10,632,144
  
Actuarial loss from changes in demographic assumptions
    
(430,315
)
    
—
      
—
      
(430,315
)
Actuarial gain from changes in financial assumptions
    
1,900,436
      
—
      
—
      
1,900,436
  
Changes in the asset ceiling during the period and others
    
—
      
—
      
(2,247,990
)
    
(2,247,990
)
Return on plan assets greater than discount rate (shortfall)
  
—
    
(6,210,593
)
  
—
    
(6,210,593
)
Recognized in other comprehensive income
   Ps. 12,102,265     Ps. (6,210,593 )   Ps. (2,247,990 )   Ps. 3,643,682  
Contributions made by plan participants
    
45,404
      
(45,404
)
    
—
      
—
  
Contributions to the pension plan made by the Company
    
—
      
(10,853
)
    
—
      
(10,853
)
Benefits paid
    
(27,844,968
)
    
27,547,809
      
—
      
(297,159
)
Payments to employees
    
(10,868,600
)
    
—
      
—
      
(10,868,600
)
Plan changes
    
(29,383
)
    
—
      
—
      
(29,383
)
Effect of translation
  
(4,745,061
)
  
3,259,358
    
(346,706
)
  
(1,832,409
)
Others
   Ps. (43,442,608 )   Ps. 30,750,910     Ps. (346,706 )   Ps. (13,038,404 )
Balance at the end of the year
    
334,458,153
      
(204,092,587
)
    
4,055,040
      
134,420,606
  
Less short-term portion
    
(232,102
)
    
—
       —      
(232,102
)
Non-current obligation
   Ps. 334,226,051     Ps. (204,092,587 )   Ps. 4,055,040     Ps. 134,188,504  

   
At December 31, 2024
  
   
DBO
    
Plan Assets
    
Effect of asset
ceiling
    
Net employee
benefit liability
  
Balance at the beginning of the year
   Ps. 334,458,153     Ps. (204,092,587 )   Ps. 4,055,040     Ps. 134,420,606  
Current service cost
    
1,889,699
      
—
      
—
      
1,889,699
  
Interest cost on projected benefit obligation
    
34,540,808
      
—
      
—
      
34,540,808
  
Expected return on plan assets
    
—
      
(20,306,050
)
    
—
      
(20,306,050
)
Changes in the asset ceiling during the period and others
    
—
      
—
      
357,182
      
357,182
  
Past service costs and other
    
(103,657
)
    
139,115
      
—
      
35,458
  
Actuarial gain for changes in experience
   
(42,968
)
    
—
      
—
      
(42,968
)
Actuarial loss from changes in financial assumptions     
 
(23,068
)
  
—
    
—
    
(23,068
)
Net period cost
   Ps. 36,260,814     Ps. (20,166,935 )   Ps. 357,182     Ps. 16,451,061  
Actuarial loss for changes in experience    
   
13,338,950
      
—
      
—
      
13,338,950
  
Actuarial gain from changes in demographic assumptions
    
(3,654
)
    
—
      
—
      
(3,654
)
Actuarial loss from changes in financial assumptions 
   
(3,018,488
)
    
—
      
—
       (3,018,488 )
Changes in the asset ceiling during the period and others  
   
—
      
—
      
345,672
      
345,672
  
Return on plan assets greater than discount rate (shortfall)   
 
—
    
20,947,473
    
—
    
20,947,473
  
Recognized in other comprehensive income
   Ps. 10,316,808     Ps. 20,947,473     Ps. 345,672     Ps. 31,609,953  
Contributions made by plan participants
    
40,319
      
(40,319
)
    
—
      
—
  
Contributions to the pension plan made by the Company
    
—
      
(548,872
)
    
—
      
(548,872
)
Benefits paid
    
(16,298,480
)
    
15,970,322
      
—
      
(328,158
)
Payments to employees
    
(24,325,925
)
    
—
      
—
      
(24,325,925
)
Plan changes
    
(847,269
)
    
—
              
(847,269
)
Effect of translation     
 
3,816,947
    
(2,104,890
)
  
(276,850
)
  
1,435,207
  
Others
   Ps.
(37,614,408 )   Ps. 13,276,241     Ps. (276,850 )   Ps. (24,615,017 )
Balance at the end of the year      
   
343,421,367
      
(190,035,808
)
    
4,481,044
      
157,866,603
  
Less short-term portion
    
(292,907
)
    
—
      
—
      
(292,907
)
Non-current obligation
   Ps. 343,128,460     Ps. (190,035,808 )   Ps. 4,481,044     Ps. 157,573,696  

   
At December 31, 2025
  
   
DBO
    
Plan Assets
    
Effect of asset
ceiling
    
Net employee
benefit liability
  
Balance at the beginning of the year
   Ps. 343,421,367     Ps. (190,035,808 )   Ps. 4,481,044     Ps. 157,866,603  
Current service cost
    
1,734,007
      
—
      
—
      
1,734,007
  
Interest cost on projected benefit obligation
    
35,248,608
      
—
      
—
      
35,248,608
  
Expected return on plan assets
    
—
      
(18,507,640
)
    
—
      
(18,507,640
)
Changes in the asset ceiling during the period and others
    
—
      
—
      
537,729
      
537,729
  
Past service costs and other
    
(8,463
)
    
144,253
       —      
135,790
  
Actuarial gain for changes in experience
    
(47,141
)
    
—
      
—
      
(47,141
)
Actuarial loss from changes in demographic assumptions
    
586
      
—
      
—
      
586
  
Actuarial gain from changes in financial assumptions
  
(21,087
)
    
—
      
—
      
(21,087
)
Net period cost
   Ps. 36,906,510     Ps. (18,363,387 )   Ps. 537,729     Ps. 19,080,852  
Actuarial loss for changes in experience
    
45,254,349
      
—
      
—
      
45,254,349
  
Actuarial gain from changes in demographic assumptions
    
(29,753
)
    
—
      
—
      
(29,753
)
Actuarial loss from changes in financial assumptions
    
426,187
      
—
      
—
      
426,187
  
Changes in the asset ceiling during the period and others    
   
—
      
—
      
(1,053,402
)
    
(1,053,402
)
Return on plan assets greater than discount rate (shortfall)     
 
—
      
(7,272,626
)
    
—
      
(7,272,626
)
Recognized in other comprehensive income
   Ps. 45,650,783     Ps. (7,272,626 )   Ps. (1,053,402 )   Ps. 37,324,755  
Contributions made by plan participants
    
40,961
      
(40,961
)
    
—
      
—
  
Contributions to the pension plan made by the Company
   
—
      
(957,068
)
    
—
      
(957,068
)
Benefits paid
    
(24,728,015
)
    
24,381,561
      
—
      
(346,454
)
Payments to employees
    
(17,587,028
)
    
10,558
      
—
      
(17,576,470
)
Effect of translation
    
(2,792,758
)
    
2,121,319
      
15,300
      
(656,139
)
Others
   Ps. (45,066,840 )   Ps. 25,515,409     Ps. 15,300     Ps. (19,536,131 )
Balance at the end of the year
    
380,911,820
      
(190,156,412
)
    
3,980,671
      
194,736,079
  
Less short-term portion
    
(282,097
)
    
—
      
—
      
(282,097
)
Non-current obligation
   Ps. 380,629,723     Ps. (190,156,412 )   Ps. 3,980,671     Ps. 194,453,982  
Plan Assets Invested
Plan assets are invested in:

At December 31


  
2024
    
2025
  
   
Puerto Rico
    
Brazil
    
Mexico
    
Puerto Rico
    
Brazil
    
Mexico
  
Equity instruments
    
53
%
    
—
      
76
%
    
59
%
    
—
      
72
%
Debt instruments
    
12
%
    
93
%
    
24
%
    
11
%
    
94
%
    
28
%
Others
    
35
%
    
7
%
    
—
      
30
%
    
6
%
    
—
  

   
100
%
    
100
%
    
100
%
    
100
%
    
100
%
    
100
%
Assumptions Used in Determining Net Period Cost
The assumptions used in determining the net period cost were as follows:
 
 
2023
  
2024
  
2025
  
 
Puerto Rico
    
Brazil
    
Mexico
    
Europe
  
Puerto Rico
    
Brazil
    
Mexico
    
Europe
  
Puerto Rico
    
Brazil
    
Mexico
    
Europe
  
Discount rate and long- term rate return
   
5.13
%
    
9.050% & 9.20
%
    
11.65
%
    
3.25
%
    
5.58
%
    
11.4% & 11.07
%
    
11.43
%
    
2.75
%
    
5.30
%
    
11.05% & 11.44
%
    
9.85
%
    
2.75
%
Rate of future salary increases    
2.00
%
    
3.50
%
    
2.8
%
    
6.0%, & 3.6%, - 5.4
%
    
2.00
%
    
3.5
%
    
2.8
%
    
3.8% - 4.4% &
2.9% - 3.8
%
    
2.0
%
    
3.50
%
    
2.8
%
    
3.2% & 2.60% - 2.80
%
Percentage of increase in health care costs for the coming year
    
5.13
%
    
9.71
%
                    
5.53
%
    
9.71
%
                    
5.18
%
    
9.71
%
                
Year to which this level will be maintained
 NA
     
2032
                   NA
     
2033
                   NA
     
2033
                  
Rate of increase of pensions
                            
2.50
%
                            
1.70
%
                            
1.60
%
Employee turnover rate*
                            
0.00%-0.91
%
                            
0.00%-0.90
%
                            
0.0%- 0.87
%

*
Depending on years of service
Increase (Decrease) in DBO Pension and Other Benefits Liability The increase (decrease) in the DBO pension and other benefits liability at December 31, 2025 are as follows:
 
 
   -100 points     +100 points  
Discount rate
   Ps.
29,611,395     Ps.
(20,782,860 )
Health care cost trend rate
   Ps.
(254,950 )   Ps.
287,048
  
Long-Term Direct Employee Benefits

   
Balance at
December 31,
2023
    
Effect of
translation
    
Increase of
the year
    
Payments
    
Balance at
December 31,
2024
  
Direct employee benefits
   Ps.
5,389,795
     Ps.
619,696
  Ps.
1,102,643
     Ps.
(2,066,976
)
   Ps.
5,045,158
  

   
Balance at
December 31,
2024
    
Effect of
translation
    
Increase of
the year
    
Payments
    
 Balance at
December 31,
2025
  
Direct employee benefits
   Ps.
5,045,158
     Ps.
37,196
     Ps.
1,910,231
     Ps.
(2,391,624
)
   Ps.
4,600,961