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Post-employment Benefits - Changes in net post-employment (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Post-employment pension plans.    
Beginning of year $ 2,080,651 $ 1,468,112
Net periodic cost 259,291 292,026
Contributions (6,972) (600)
Remeasurement adjustments (279,825) 344,313
Benefits paid (139,465) (23,200)
End of year 1,913,680 2,080,651
Pensions    
Post-employment pension plans.    
Beginning of year 1,724,801  
Net periodic cost 156,659  
Remeasurement adjustments (327,898) 250,283
Benefits paid (89,757)  
End of year 1,463,805 1,724,801
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 355,850  
Net periodic cost 102,632  
Contributions (6,972)  
Remeasurement adjustments 48,073 94,030
Benefits paid (49,708)  
End of year $ 449,875 $ 355,850