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Investment Properties - Key Assumptions and Fair Values of Investment Properties (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
Disclosure of detailed information about investment property [Line Items] |  |  |
Investment properties | $ 12,302 | $ 375 | $ 9,805
Bottom of Range [Member] |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |
Overall capital interest rate | 1.47% | 1.47% | 1.43%
Profit margin ratio | 12.00% | 12.00% | 10.00%
Discount rate | 0.00% |  |
Capitalization rate | 1.12% | 1.12% | 0.23%
Top of Range [Member] |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |
Overall capital interest rate | 5.81% | 5.81% | 5.51%
Profit margin ratio | 20.00% | 20.00% | 20.00%
Discount rate | 10.00% |  |
Capitalization rate | 2.13% | 2.13% | 2.28%
At fair value [Member] |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |
Investment properties | $ 41,285 |  | $ 24,237

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- Definition Capital interest rate. + References No definition available. + Details
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- Definition Discount rate on investment properties. + References No definition available. + Details
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- Definition Investment property capitalization rates. + References No definition available. + Details
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- Definition Profit margin ratio. + References No definition available. + Details
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- Definition The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_76&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_d&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_b&doctype=Standard -URIDate 2024-03-27 + Details
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