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Property, Plant and Equipment - Summary of Assets Used by the Company (Detail) $ in Millions, $ in Millions | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
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Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Assets used by the Company | $ 289,840 | $ 8,839 | $ 292,338 |
Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Assets used by the Company | 5,125 |  | 7,253 | $ 6,199
Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Assets used by the Company | $ 284,715 |  | $ 285,085 | $ 285,329

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_a&doctype=Standard -URIDate 2024-03-27 + Details
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