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Post-employment Benefits - Net periodic (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Post-employment Benefits    
Service cost $ 175,648 $ 148,987
Interest cost 193,313 187,470
Prior service cost for plan amendments (40,124) 40,542
Interest on plan assets (69,546) (84,973)
Net periodic cost $ 259,291 $ 292,026