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Summary of Material Accounting Policy Information - Summary of Subsidiaries (Parenthetical) (Detail) - shares | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of subsidiaries [line items] |  |
Number of shares in entity held by entity | 72,941,000 | 72,941,000
Bottom of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Number of shares in entity held by entity | 1 |
Percentage of total shares held in Subsidiaries | 0.10% |

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- Definition Percentage of total shares held in Subsidiaries. + References No definition available. + Details
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Namespace Prefix: | asx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Total for all associates [member]; Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_vi&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |