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Financial Instruments - Information About the Maturity Analysis for Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Lease liabilities | $ 11,148 | $ 11,213
Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Lease liabilities | 3,586 | 3,519
1-3 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Lease liabilities | 5,255 | 4,819
3-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Lease liabilities | 2,143 | 2,357
More Than 5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Lease liabilities | $ 164 | $ 518

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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 58 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_58&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph B11D -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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