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Post-employment Benefits - Reconciliation (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Post-employment benefit plans      
Vested benefit obligations $ 932,741 $ 788,714  
Unvested benefit obligations 2,343,659 2,058,894  
Defined benefit obligation 3,276,400 2,847,608  
Fair value of plan assets 1,195,749 1,379,496  
Underfunded status of the plan assets 2,080,651 1,468,112  
Post-employment benefit liability (asset) 2,080,651 1,468,112 $ 962,497
Pensions      
Post-employment benefit plans      
Vested benefit obligations 556,619 449,752  
Unvested benefit obligations 2,077,506 1,890,108  
Defined benefit obligation 2,634,125 2,339,860  
Fair value of plan assets 909,324 1,051,076  
Underfunded status of the plan assets 1,724,801 1,288,784  
Post-employment benefit liability (asset) 1,724,801 1,288,784  
Seniority Premiums      
Post-employment benefit plans      
Vested benefit obligations 376,122 338,962  
Unvested benefit obligations 266,153 168,786  
Defined benefit obligation 642,275 507,748  
Fair value of plan assets 286,425 328,420  
Underfunded status of the plan assets 355,850 179,328  
Post-employment benefit liability (asset) $ 355,850 $ 179,328