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Income Tax - Summary of Reconciliation of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Major components of tax expense (income) [abstract]        
Profit before income tax $ 81,763,628 $ 2,660,711 $ 80,193,769 $ 35,768,798
Income tax expense calculated at the statutory rates 35,906,719 1,168,458 33,697,736 16,907,904
Nontaxable expense (income) in determining taxable income (177,734) (5,784) 357,936 316,619
Tax-exempt income (14,789,999) (481,289) (14,578,355) (387,212)
Additional income tax on unappropriated earnings 844,855 27,493 3,684,138 680,649
Income tax credits (2,514,002) (81,809) (1,654,821) (1,191,387)
The origination and reversal of temporary differences 1,304,931 42,465 78,544 (6,033,652)
Income tax adjustments on prior years (209,150) (6,806) (112,527) (472,512)
Unrecognized deferred tax liability for temporary differences associated with investments (3,523,716) (114,667) (6,135,120) (2,616,917)
Unrecognized loss carryforwards 271,730 8,843 288,025  
Realized investment loss on merger of subsidiary 0 0   (138,890)
Withholding tax 31,900 1,038 87,175 52,296
Land value increment tax 0 0 117,341  
Capital gains tax 0 0 2,113,700  
Income tax expense recognized in profit or loss $ 17,145,534 $ 557,941 $ 17,943,772 $ 7,116,898