XML 125 R108.htm IDEA: XBRL DOCUMENT
v3.25.1

Significant Subsequent Events - Additional Information (Detail) $ in Millions | 4 Months Ended
--- | ---
Apr. 24, 2025 TWD ($)
Non Adjusting Events After Reporting Period [Member] |
Disclosure of subsidiaries [line items] |
Total amount of repayments of the long-term loans which were classified as non-current liabilities | $ 11,102

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
Name: | ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total amount of repayments of the long-term loans which were classified as non-current liabilities. + References No definition available. + Details
Name: | umc_TotalAmountOfRepaymentsOfTheLongTermLoansWhichWereClassifiedAsNonCurrentLiabilities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=umc_NonAdjustingEventsAfterReportingPeriodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |