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Investment Properties - Schedule of Future Aggregate Lease Collection Under Operating Lease for Investment Properties (Detail) - TWD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | $ 2,427 | $ 1,082
Year 1 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 274 | 168
Year 2 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 248 | 157
Year 3 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 217 | 134
Year 4 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 192 | 105
Year 5 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 190 | 83
Onwards [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | $ 1,306 | $ 435

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 97 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_97&doctype=Standard -URIDate 2024-03-27 + Details
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