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Post-employment Benefits - Fair value of plan assets (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-employment pension plans.    
Beginning of year $ 962,497 $ 716,095
Return on plan assets 112,788 120,591
Benefits paid 541 21,840
End of year 1,468,112 962,497
Pensions    
Post-employment pension plans.    
Beginning of year 926,050  
Benefits paid 15,087  
End of year 1,288,784 926,050
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 36,447  
End of year 179,328 36,447
Plan assets    
Post-employment pension plans.    
Beginning of year (1,515,030) (1,703,058)
Return on plan assets 112,788 120,591
Remeasurement on plan assets (33,389) (146,963)
Benefits paid (214,933) (161,656)
End of year (1,379,496) (1,515,030)
Plan assets | Pensions    
Post-employment pension plans.    
Beginning of year (1,108,176)  
Return on plan assets 82,002  
Remeasurement on plan assets (17,227)  
Benefits paid (121,875)  
End of year (1,051,076) (1,108,176)
Plan assets | Seniority Premiums    
Post-employment pension plans.    
Beginning of year (406,854)  
Return on plan assets 30,786  
Remeasurement on plan assets (16,162)  
Benefits paid (93,058)  
End of year $ (328,420) $ (406,854)