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Financial Risk and Fair Value Disclosures - Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity (Parenthetical) (Detail) - TWD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Investments in equity instruments designated at fair value through other comprehensive income | $ 5,753 | $ 3,213
Unsecured Exchangeable Bonds [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Redemption of bonds at put price at the option of bondholders, date | Jul. 07, 2024 |
Redemption of bonds at put price at the option of bondholders percentage of principal amount | 98.14% |

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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 11A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_h&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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