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Profit Before Income Tax - Summary of Other Gains and Losses (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Net gain on financial assets mandatorily at FVTPL | $ 11,726,761 | $ 357,632 | $ 6,155,995 | $ 10,244,928
Net loss arising on financial instruments held for trading | (1,908,202) | (58,195) | (4,295,484) | (6,137,183)
Gain on disposal of subsidiaries (Note 30) | 0 | 0 | 529,721 | 0
Foreign exchange gains (losses), net | (5,538,433) | (168,907) | 998,111 | (2,459,474)
Gain on bargain purchase (Note 29) | 76,715 | 2,340 | 0 | 0
Impairment loss on investments accounted for using the equity method (Note 14) | (42,143) | (1,285) | 0 | (61,206)
Gain on disposal of investments accounted for using the equity method | 20,952 | 639 | 55,795 | 80,317
Others | 14,342 | 438 | 0 | 0
Other gains and losses | $ 4,349,992 | $ 132,662 | $ 3,444,138 | $ 1,667,382

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- Definition Gains losses on financial assets and liabilities at fair value through profit or loss classified as held for trading. + References No definition available. + Details
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- Definition Adjustments for gain (loss) on disposals investments in subsidiaries, joint ventures and associates to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Total for all associates [member]; Total for all joint ventures [member]; Total for all subsidiaries [member]; Investments in subsidiaries, joint ventures and associates reported in separate financial statements; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Classes of financial instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2024-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2024-en-r&anchor=para_52_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_35&doctype=Standard -URIDate 2024-03-27 + Details
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