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Financial Assets at Amortized Cost - Noncurrent - Additional Information (Detail) - TWD ($) $ in Millions | Dec. 31, 2024 | Oct. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Corporate bonds | $ 30,488 |  | $ 30,483
Fubon Life Insurance Co [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Corporate bonds | $ 2,000 | $ 2,000 | $ 0

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- Definition The amount of investments in corporate bonds. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of bonds issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |