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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Product (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Products [Line Items]
Revenue from contracts with customers	$ 232,302,584	$ 222,533,000	$ 278,705,264
Wafer [member]
Disclosure Of Products [Line Items]
Revenue from contracts with customers	221,820,412	211,750,622	265,600,173
Other products [member]
Disclosure Of Products [Line Items]
Revenue from contracts with customers	$ 10,482,172	$ 10,782,378	$ 13,105,091

X

- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 114
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 113
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Disclosure of products.

+ References

No definition available.

+ Details

Name:	umc_DisclosureOfProductsLineItems
Namespace Prefix:	umc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=umc_WaferMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=umc_OtherProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: