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Transactions with Related Parties - Compensation (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Transactions with related parties        
Defined benefit obligation $ 2,847,608 $ 2,477,527    
Service cost 131,662 129,707    
Directors, alternate directors and officers        
Transactions with related parties        
Key management compensation 869,556 568,347 $ 892,769  
Defined benefit obligation 170,856 148,651 164,018  
Cumulative contributions made by the Group to the pension and seniority premium plans on behalf of these directors and officers 82,768 90,901 115,467  
Officers | Cable        
Transactions with related parties        
Defined benefit obligation   1,258,013 1,058,818  
Deferred compensation plan term       5 years
Service cost 199,195 251,787 $ 302,801  
Contributions to plan, net defined benefit liability (asset) $ 700,000 $ 350,000