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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, 2023 | Dec. 31, 2022
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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 | $ 37,523,694 | $ 37,259,181
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 | 15,395,514 | 35,263,925
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 | $ 22,128,180 | $ 1,995,256

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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_e&doctype=Standard -URIDate 2023-03-23 + Details
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