v3.26.1
Post-employment Benefits - Fair value plan assets (Details) - MXN ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Plan assets measured at fair value      
Total investment assets and cash management $ (954,248) $ (772,482) $ (733,049)
Plan assets      
Plan assets measured at fair value      
Total investment assets and cash management 420,403 431,982 $ 474,479
Plan assets | Recurring basis      
Plan assets measured at fair value      
Mutual funds (fixed rate instruments) 28,894 25,095  
Money market securities 169,603 207,910  
Total investment assets 406,951 419,996  
Cash management 13,452 11,986  
Total investment assets and cash management 420,403 431,982  
Plan assets | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Plan assets measured at fair value      
Mutual funds (fixed rate instruments) 28,894 25,095  
Money market securities 169,603 207,910  
Total investment assets 406,951 419,996  
Total investment assets and cash management 406,951 419,996  
Plan assets | Recurring basis | Trading equity securities - Common stock      
Plan assets measured at fair value      
Equity instruments 32,239 21,236  
Plan assets | Recurring basis | Trading equity securities - Common stock | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Plan assets measured at fair value      
Equity instruments 32,239 21,236  
Plan assets | Recurring basis | Other equity securities      
Plan assets measured at fair value      
Equity instruments 176,215 165,755  
Plan assets | Recurring basis | Other equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Plan assets measured at fair value      
Equity instruments $ 176,215 $ 165,755