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Income Taxes - Summary of Deferred Tax Related to Items Recognized in OCI (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Major components of tax expense (income) [abstract]      
Remeasurement of defined benefit plans $ (4,760,089) $ 4,151,600 $ 9,217,320
Equity investments at fair value 583,892 (665,814) (378,606)
Other 0 (35,670) 0
Revaluation assets 0 (29,922,597)  
Deferred tax benefit recognized in OCI $ (4,176,197) $ (26,472,481) $ 8,838,714