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Post-employment Benefits - Net periodic (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-employment Benefits    
Service cost $ 131,662 $ 129,707
Interest cost 193,344 170,653
Prior service cost for plan amendments 46,846 (8,613)
Interest on plan assets (112,788) (120,591)
Net periodic cost $ 259,064 $ 171,156