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Post-employment Benefits - Fair value plan assets (Details) - MXN ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Plan assets measured at fair value      
Post-employment benefit liability (asset) $ 1,913,680 $ 2,080,651 $ 1,468,112
Plan assets      
Plan assets measured at fair value      
Post-employment benefit liability (asset) (1,270,685) (1,195,749) $ (1,379,496)
Plan assets | Recurring basis      
Plan assets measured at fair value      
Mutual funds (fixed rate instruments) 115,185 231,837  
Money market securities 726,781 607,658  
Post-employment benefit liability (asset) 1,270,685 1,195,749  
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) 115,185 231,837  
Money market securities 726,781 607,658  
Post-employment benefit liability (asset) 1,270,685 1,195,749  
Plan assets | Recurring basis | Trading equity securities - Common stock      
Plan assets measured at fair value      
Equity instruments 119,851 101,690  
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 119,851 101,690  
Plan assets | Recurring basis | Other equity securities      
Plan assets measured at fair value      
Equity instruments 308,868 254,564  
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 $ 308,868 $ 254,564