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Net Income - Other Gains and Losses (Detail) $ in Millions, $ in Millions | 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] |  |  |  |
Valuation loss on financial assets and liabilities at fair value through profit or loss, net | $ (147) | $ (4) | $ (98) | $ (206)
Foreign currency exchange gain or loss, net | (22) |  | (116) | (185)
Gain (loss) on disposal of investments accounted for using equity method, net | 85 | 3 | 6 | (14)
Gain (loss) on disposal of financial instruments, net | 1 |  | 0 | 1
Others | (11) |  | (71) | (14)
Other gains and losses | $ (94) | $ (3) | $ (279) | $ (418)

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- Definition Gain (loss) on disposal of financial instruments, net. + References No definition available. + Details
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- Definition Gain (loss) on disposal of investments accounted for using equity method, net. + References No definition available. + Details
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- Definition Gains losses on financial assets and liabilities at fair value through profit or loss. + References No definition available. + Details
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- Definition Miscellaneous other gains (losses). + References No definition available. + 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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- Definition The gains (losses) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_103&doctype=Standard -URIDate 2024-03-27 + Details
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