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Contents of Significant Accounts - Unused Tax Loss Carry-forward for Which No Deferred Income Tax Assets have been Recognized (Detail) - TWD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry-forward for which no deferred income tax assets have been recognized	$ 31,169,559	$ 37,523,694
1-5 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry-forward for which no deferred income tax assets have been recognized	19,761,573	15,395,514
6-10 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry-forward for which no deferred income tax assets have been recognized	$ 11,407,986	$ 22,128,180