XML 162 R89.htm IDEA: XBRL DOCUMENT v3.21.1
Income Taxes - Summary of Deferred Tax Related to Items Recognized in OCI (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major components of tax expense (income) [abstract]      
Remeasurement of defined benefit plans $ 4,151,600 $ 9,217,320 $ 408,735
Equity investments at fair value (665,814) (378,606) 1,613,667
Other (35,670)   (8,922)
Revaluation assets (29,922,597)    
Deferred tax benefit recognized in OCI $ (26,472,481) $ 8,838,714 $ 2,013,480