XML 143 R124.htm IDEA: XBRL DOCUMENT v3.21.1
Post-employment Benefits - Sensitivity (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Sensitivity analysis    
Discount rate (as a percent) 6.60% 7.00%
Discount rate    
Sensitivity analysis    
Decrease in actuarial assumption (in basis points) 0.50% 0.50%
Increase in actuarial assumption $ 3,382,711 $ 3,037,398