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Investment Properties - Summary of Investment Properties (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | $ 9,805 |  |  |
Depreciation expense | (45) |  | $ (45) | $ (44)
Impairment loss | 0 | $ 0 | 0 | (9)
Reversal of impairment loss | 139 |  |  | 107
Ending balance | 12,302 | $ 375 | 9,805 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | 11,162 |  | 10,780 | 10,663
Additions | 4 |  | 54 | 18
Reclassification | 2,427 |  | 328 | 99
Ending balance | 13,593 |  | 11,162 | 10,780
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | (1,357) |  | (976) | (1,000)
Depreciation expense | (45) |  | (45) | (44)
Impairment loss |  |  | (336) | (9)
Reversal of impairment loss | 139 |  |  | 107
Reclassification | (28) |  |  | (39)
Ending balance | (1,291) |  | (1,357) | (976)
Beginning balance, net | 9,805 |  | 9,804 |
Ending balance, net | $ 12,302 |  | $ 9,805 | $ 9,804

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- Definition The amount of depreciation recognised on investment property. [Refer: Depreciation and amortisation expense; Investment property] + 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 -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_d_iv&doctype=Standard -URIDate 2024-03-27 + Details
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