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Post-employment Benefits - Benefit obligation (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Post-employment pension plans.    
Beginning of year $ 1,468,112 $ 962,497
Service cost 148,987 131,662
Interest cost 187,470 193,344
Benefits paid (23,200) (541)
Past service cost 40,542 46,846
End of year 2,080,651 1,468,112
Pensions    
Post-employment pension plans.    
Beginning of year 1,288,784  
End of year 1,724,801 1,288,784
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 179,328  
Benefits paid (23,200)  
End of year 355,850 179,328
Defined benefit obligation    
Post-employment pension plans.    
Beginning of year 2,847,608 2,477,527
Service cost 148,987 131,662
Interest cost 187,470 193,344
Benefits paid (221,184) (215,474)
Remeasurement of post-employment benefit obligations 272,977 213,703
Past service cost 40,542 46,846
End of year 3,276,400 2,847,608
Defined benefit obligation | Pensions    
Post-employment pension plans.    
Beginning of year 2,339,860  
Service cost 90,045  
Interest cost 150,253  
Benefits paid (154,542)  
Remeasurement of post-employment benefit obligations 198,995  
Past service cost 9,514  
End of year 2,634,125 2,339,860
Defined benefit obligation | Seniority Premiums    
Post-employment pension plans.    
Beginning of year 507,748  
Service cost 58,942  
Interest cost 37,217  
Benefits paid (66,642)  
Remeasurement of post-employment benefit obligations 73,982  
Past service cost 31,028  
End of year $ 642,275 $ 507,748