XML 91 R75.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Contents of Significant Accounts - Non-controlling Interests (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Equity [abstract] |  |  |  |
Beginning balance | $ 343,679 |  | $ 223,181 | $ 113,356
Impact of retroactive applications | 0 |  | (66,089) | 0
Adjusted beginning balance | 343,679 |  | 157,092 | 113,356
Net income (loss) | 450,184 | $ 14,702 | 819,960 | (668,245)
Other comprehensive income (loss) | (14) |  | 8 | (19)
Share-based payment transactions | 5,817 |  | 1,490 | 0
Changes in subsidiaries' ownership | 456 |  | (1,339) | (11,126)
Non-Controlling Interests | 4,187 |  | 5,456 | 23,430
Derecognition of the non-controlling interests | (463,450) |  | (638,988) | 765,785
Ending balance | $ 340,859 | $ 11,132 | $ 343,679 | $ 223,181

X
- References No definition available. + Details
Name: | ifrs-full_EquityAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_51_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 12 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_12_f&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2023-01-01 -Paragraph 22 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2023-en-r&anchor=para_22&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph q -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_q&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NoncontrollingInterests
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of other comprehensive income attributable to non-controlling interests. [Refer: Non-controlling interests; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_OtherComprehensiveIncomeAttributableToNoncontrollingInterests
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The profit (loss) from continuing and discontinued operations attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 12 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_12_e&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 81B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_81B_a_i&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProfitLossAttributableToNoncontrollingInterests
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Adjusted beginning balance of non-controlling interests after adopting new accounting principle. + References No definition available. + Details
Name: | umc_AdjustedBeginningBalanceOfNoncontrollingInterestsAfterAdoptingNewAccountingPrinciple
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cumulative effect adjustment of adopting new accounting principle on non-controlling interests. + References No definition available. + Details
Name: | umc_CumulativeEffectAdjustmentOfAdoptingNewAccountingPrincipleOnNoncontrollingInterests
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (decrease) in noncontrolling interests. + References No definition available. + Details
Name: | umc_IncreaseDecreaseInNoncontrollingInterests
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Non-controlling interests changes in subsidiaries ownership. + References No definition available. + Details
Name: | umc_NoncontrollingInterestsChangesInSubsidiariesOwnership
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Derecognition of non-controlling interests. + References No definition available. + Details
Name: | umc_NoncontrollingInterestsDerecognitionOfNoncontrollingInterests
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration