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Financial Risk and Fair Value Disclosures - Details of Forward Exchange Contracts (Detail) - Forward exchange contracts [member] $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Disclosure of detailed information about financial instruments [line items]
Notional Amount on sale of foreign currency	$ 24
Contract Period, beginning date	Dec. 27, 2024
Contract Period, end date	Jan. 21, 2025

X

- 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

X

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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

X

- Definition

Beginning date of forward exchange contract period.

+ References

No definition available.

+ Details

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Namespace Prefix:	umc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

End date of forward exchange contract period.

+ References

No definition available.

+ Details

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Namespace Prefix:	umc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: