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Post-employment Benefits - Benefit obligation (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-employment pension plans.    
Beginning of year $ 962,497 $ 716,095
Service cost 131,662 129,707
Interest cost 193,344 170,653
Benefits paid (541) (21,840)
Past service cost 46,846 (8,613)
End of year 1,468,112 962,497
Pensions    
Post-employment pension plans.    
Beginning of year 926,050  
Benefits paid (15,087)  
End of year 1,288,784 926,050
Seniority Premiums    
Post-employment pension plans.    
Beginning of year 36,447  
Benefits paid 14,546  
End of year 179,328 36,447
Defined benefit obligation    
Post-employment pension plans.    
Beginning of year 2,477,527 2,419,153
Service cost 131,662 129,707
Interest cost 193,344 170,653
Benefits paid (215,474) (183,496)
Remeasurement of post-employment benefit obligations 213,703 (49,877)
Past service cost 46,846 (8,613)
End of year 2,847,608 2,477,527
Defined benefit obligation | Pensions    
Post-employment pension plans.    
Beginning of year 2,034,226  
Service cost 81,483  
Interest cost 158,065  
Benefits paid (136,962)  
Remeasurement of post-employment benefit obligations 165,775  
Past service cost 37,273  
End of year 2,339,860 2,034,226
Defined benefit obligation | Seniority Premiums    
Post-employment pension plans.    
Beginning of year 443,301  
Service cost 50,179  
Interest cost 35,279  
Benefits paid (78,512)  
Remeasurement of post-employment benefit obligations 47,928  
Past service cost 9,573  
End of year $ 507,748 $ 443,301