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Investment Properties - Summary of Investment Properties (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | $ 9,804 |  |  |
Depreciation expense | (45) |  | $ (44) | $ (42)
Impairment loss | 0 | $ 0 | (9) | (29)
Reversal of impairment loss |  |  | 107 | 83
Ending balance | 9,805 | $ 320 | 9,804 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | 10,780 |  | 10,663 | 10,662
Additions | 54 |  | 18 | 1
Reclassification | 328 |  | 99 |
Ending balance | 11,162 |  | 10,780 | 10,663
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | (976) |  | (1,000) | (1,041)
Depreciation expense | (45) |  | (44) | (42)
Impairment loss | (336) |  | (9) | (29)
Reclassification |  |  | (39) |
Reversal of impairment loss |  |  | 107 | 83
Ending balance | (1,357) |  | (976) | (1,000)
Beginning balance, net | 9,804 |  | 9,663 |
Ending balance, net | $ 9,805 |  | $ 9,804 | $ 9,663

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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 2023-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2023-en-r&anchor=para_76&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph d -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2023-en-r&anchor=para_79_d_iv&doctype=Standard -URIDate 2023-03-23 + Details
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