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Post-employment Benefits - Fair value plan assets (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Plan assets measured at fair value      
Post-employment benefit liability (asset) $ 1,468,112 $ 962,497 $ 716,095
Plan assets      
Plan assets measured at fair value      
Post-employment benefit liability (asset) (1,379,496) (1,515,030) $ (1,703,058)
Plan assets | Recurring basis      
Plan assets measured at fair value      
Mutual funds (fixed rate instruments) 218,269 208,565  
Money market securities 766,181 880,808  
Post-employment benefit liability (asset) 1,379,496 1,515,030  
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) 218,269 208,565  
Money market securities 766,181 880,808  
Post-employment benefit liability (asset) 1,379,496 1,515,030  
Plan assets | Recurring basis | Trading equity securities - Common stock      
Plan assets measured at fair value      
Equity instruments 136,963 152,367  
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 136,963 152,367  
Plan assets | Recurring basis | Other equity securities      
Plan assets measured at fair value      
Equity instruments 258,083 273,290  
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 $ 258,083 $ 273,290