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Post-employment Benefits - Benefit obligation (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
Service cost 175,648 148,987
Interest cost 193,313 187,470
Benefits paid (139,465) (23,200)
Past service cost (40,124) 40,542
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  
Benefits paid (49,708)  
End of year 449,875 355,850
Defined benefit obligation    
Post-employment pension plans.    
Beginning of year 3,276,400 2,847,608
Service cost 175,648 148,987
Interest cost 193,313 187,470
Benefits paid (222,035) (221,184)
Remeasurement of post-employment benefit obligations (198,837) 272,977
Past service cost (40,124) 40,542
End of year 3,184,365 3,276,400
Defined benefit obligation | Pensions    
Post-employment pension plans.    
Beginning of year 2,634,125  
Service cost 101,550  
Interest cost 146,941  
Benefits paid (157,261)  
Remeasurement of post-employment benefit obligations (243,332)  
Past service cost (39,326)  
End of year 2,442,697 2,634,125
Defined benefit obligation | Seniority Premiums    
Post-employment pension plans.    
Beginning of year 642,275  
Service cost 74,098  
Interest cost 46,372  
Benefits paid (64,774)  
Remeasurement of post-employment benefit obligations 44,495  
Past service cost (798)  
End of year $ 741,668 $ 642,275