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Post-employment Benefits - Reconciliation (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Post-employment benefit plans      
Vested benefit obligations $ 788,714 $ 617,929  
Unvested benefit obligations 2,058,894 1,859,598  
Defined benefit obligation 2,847,608 2,477,527  
Fair value of plan assets 1,379,496 1,515,030  
Underfunded status of the plan assets 1,468,112 962,497  
Post-employment benefit liability (asset) 1,468,112 962,497 $ 716,095
Pensions      
Post-employment benefit plans      
Vested benefit obligations 449,752 312,454  
Unvested benefit obligations 1,890,108 1,721,772  
Defined benefit obligation 2,339,860 2,034,226  
Fair value of plan assets 1,051,076 1,108,176  
Underfunded status of the plan assets 1,288,784 926,050  
Post-employment benefit liability (asset) 1,288,784 926,050  
Seniority Premiums      
Post-employment benefit plans      
Vested benefit obligations 338,962 305,475  
Unvested benefit obligations 168,786 137,826  
Defined benefit obligation 507,748 443,301  
Fair value of plan assets 328,420 406,854  
Underfunded status of the plan assets 179,328 36,447  
Post-employment benefit liability (asset) $ 179,328 $ 36,447