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Assets Pledged as Collateral or for Security - Summary of Assets Pledged as Collateral or for Security (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)
Assets Pledged As Collateral or For Security [abstract]
Inventories related to real estate business	$ 2,717,813	$ 82,885	$ 2,583,372
Trade receivables	391,030	11,925	0
Property, plant and equipment	913	28	67,958
Investment properties	18,932,469	577,385	18,915,931
Other financial assets (including current and non-current)	514,087	15,679	470,420
Total	$ 22,556,312	$ 687,902	$ 22,037,681

X

- Definition

Assets pledged as collateral or for security.

+ References

No definition available.

+ Details

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X

- Definition

Investment properties pledged as security.

+ References

No definition available.

+ Details

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Namespace Prefix:	asx_
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Balance Type:	debit
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X

- Definition

Trade receivables pledged as security.

+ References

No definition available.

+ Details

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X

- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 15
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_15_a&doctype=Standard
-URIDate 2024-03-27

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X

- Definition

The amount of inventories pledged as security for liabilities. [Refer: Inventories]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 2
-IssueDate 2024-01-01
-Paragraph 36
-Subparagraph h
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=2&code=ifrs-tx-2024-en-r&anchor=para_36_h&doctype=Standard
-URIDate 2024-03-27

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X

- Definition

The amount of non-cash collateral assets (such as debt or equity instruments) provided to a transferee, for which the transferee has the right by contract or custom to sell or repledge the collateral.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2024-01-01
-Paragraph 3.2.23
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2024-en-r&anchor=para_3.2.23_a&doctype=Standard
-URIDate 2024-03-27

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X

- Definition

The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2024-01-01
-Paragraph 74
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_74_a&doctype=Standard
-URIDate 2024-03-27

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