v3.26.1
Post-employment Benefits - Benefit obligation (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Post-employment pension plans.    
Beginning of year $ 772,482 $ 733,049
Retirement of spun-off businesses 23,403 (84,067)
Service cost 81,802 76,323
Interest cost 114,506 109,698
Benefits paid (71,737) (75,010)
Remeasurement of post-employment benefit obligations 88,707 62,779
Past service cost (18,034) (14,694)
End of year 954,248 772,482
Pensions    
Post-employment pension plans.    
Beginning of year 172,493  
Retirement of spun-off businesses 23,286  
Benefits paid (46,460)  
Remeasurement of post-employment benefit obligations 27,412  
End of year 212,665 172,493
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 599,989  
Retirement of spun-off businesses 117  
Benefits paid (25,277)  
Remeasurement of post-employment benefit obligations 61,295  
End of year 741,583 599,989
Defined benefit obligation    
Post-employment pension plans.    
Beginning of year 1,204,464 1,207,528
Retirement of spun-off businesses   (85,955)
Service cost 81,802 76,323
Interest cost 114,506 109,698
Benefits paid (98,274) (158,525)
Remeasurement of post-employment benefit obligations 90,187 70,089
Past service cost (18,034) (14,694)
End of year 1,374,651 1,204,464
Defined benefit obligation | Pensions    
Post-employment pension plans.    
Beginning of year 562,196  
Service cost 20,162  
Interest cost 49,505  
Benefits paid (72,997)  
Remeasurement of post-employment benefit obligations 28,868  
Past service cost (688)  
End of year 587,046 562,196
Defined benefit obligation | Seniority Premiums    
Post-employment pension plans.    
Beginning of year 642,268  
Service cost 61,640  
Interest cost 65,001  
Benefits paid (25,277)  
Remeasurement of post-employment benefit obligations 61,319  
Past service cost (17,346)  
End of year $ 787,605 $ 642,268