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Income Tax - Summary of Reconciliation of Income Tax Expense (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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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

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