XML 71 R54.htm IDEA: XBRL DOCUMENT v3.25.1

Contents of Significant Accounts - Leases - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosures Of Leases [Abstract]
Addition to right of use assets	$ 1,683	$ 206

X

- Definition

The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph h
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_h&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_AdditionsToRightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosures of leases

+ References

No definition available.

+ Details

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