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Income Tax - Summary of Reconciliation of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Major components of tax expense (income) [abstract]        
Profit before income tax $ 80,193,769 $ 2,890,906 $ 35,768,798 $ 23,279,811
Income tax expense calculated at the statutory rates 33,697,736 1,214,771 16,907,904 11,802,811
Nontaxable expense in determining taxable income 357,936 12,903 316,619 459,133
Tax-exempt income (14,578,355) (525,536) (387,212) (495,883)
Additional income tax on unappropriated earnings 3,684,138 132,810 680,649 19,115
Income tax credits (1,654,821) (59,655) (1,191,387) (898,198)
The origination and reversal of temporary differences 78,544 2,831 (6,033,652) (3,594,774)
Income tax adjustments on prior years (112,527) (4,056) (472,512) (352,579)
Unrecognized deferred tax liability for temporary differences associated with investments (6,135,120) (221,165) (2,616,917) (1,993,561)
Unrecognized loss carryforwards 288,025 10,383    
Realized investment loss on merger of subsidiary     (138,890)  
Withholding tax 87,175 3,143 52,296 65,182
Land value increment tax 117,341 4,230    
Capital gains tax 2,113,700 76,197    
Income tax expense recognized in profit or loss $ 17,943,772 $ 646,856 $ 7,116,898 $ 5,011,246