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Post-employment Benefits - Fair value of plan assets (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
Return on plan assets 69,546 84,973
Contributions 6,972 600
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  
Benefits paid 89,757  
End of year 1,463,805 1,724,801
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 355,850  
Contributions 6,972  
End of year 449,875 355,850
Plan assets    
Post-employment pension plans.    
Beginning of year (1,195,749) (1,379,496)
Return on plan assets 69,546 84,973
Contributions 6,972 600
Remeasurement on plan assets 80,988 (71,336)
Benefits paid (82,570) (197,984)
End of year (1,270,685) (1,195,749)
Plan assets | Pensions    
Post-employment pension plans.    
Beginning of year (909,324)  
Return on plan assets 52,506  
Remeasurement on plan assets 84,566  
Benefits paid (67,504)  
End of year (978,892) (909,324)
Plan assets | Seniority Premiums    
Post-employment pension plans.    
Beginning of year (286,425)  
Return on plan assets 17,040  
Contributions 6,972  
Remeasurement on plan assets (3,578)  
Benefits paid (15,066)  
End of year $ (291,793) $ (286,425)