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Significant Contingencies and Unrecognized Contract Commitments - Additional Information (Detail) - TWD ($) $ in Millions	Jan. 27, 2022	Dec. 31, 2024
Disclosure of contingent liabilities [line items]
Amounts available under unused letters of credit		$ 700
Customs tax and electricity supply guarantee		800
Patent license agreements and development contracts of intellectual property, contract amount		4,000
Royalties and development fees not yet recognized		1,400
Construction contracts, amount		70,900
Construction contracts not yet recognized		$ 15,200
Final Decision By The Authority [Member] | Micron Technology [Member] | Intellecutal Property And Commercial Court [Member]
Disclosure of contingent liabilities [line items]
Amount of fine	$ 20
Probation period	2 years

X

- Definition

The amount of contractual commitments for the acquisition of intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 122
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_122_e&doctype=Standard
-URIDate 2024-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of contractual commitments for the acquisition of property, plant and equipment. [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 c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_74_c&doctype=Standard
-URIDate 2024-03-27

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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.

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X

- Definition

The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 50
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_50_a&doctype=Standard
-URIDate 2024-03-27

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- Definition

Amount of fine.

+ References

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+ Details

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Namespace Prefix:	umc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of the portion of the construction contracts not yet recognized.

+ References

No definition available.

+ Details

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Namespace Prefix:	umc_
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Balance Type:	debit
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X

- Definition

Customs tax and electricity supply guarantee amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	umc_
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- Definition

Probation period.

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- Definition

The amount of the portion of royalties and development fees not yet recognized.

+ References

No definition available.

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Namespace Prefix:	umc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Details

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- Details

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- Details

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