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Post-employment Benefits - Changes in net post-employment (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-employment pension plans.    
Beginning of year $ 962,497 $ 716,095
Net periodic cost 259,064 171,156
Remeasurement adjustments 247,092 97,086
Benefits paid (541) (21,840)
End of year 1,468,112 962,497
Pensions    
Post-employment pension plans.    
Beginning of year 926,050  
Net periodic cost 194,819  
Remeasurement adjustments 183,002 70,861
Benefits paid (15,087)  
End of year 1,288,784 926,050
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 36,447  
Net periodic cost 64,245  
Remeasurement adjustments 64,090 26,225
Benefits paid 14,546  
End of year $ 179,328 $ 36,447