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Contents of Significant Accounts - Bonds Payable (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($)
--- | --- | --- | ---
Disclosure of detailed information about bonds [Line Items] |  |  |
Bonds payable | $ 38,359,352 |  | $ 28,184,687
Less: Current or exchangeable portion due within one year | (13,779,701) |  | (5,101,591)
Net | 24,579,651 | $ 802,732 | 23,083,096
Less: Discounts on bonds payable [member] |  |  |
Disclosure of detailed information about bonds [Line Items] |  |  |
Bonds payable | (498,021) |  | (672,686)
Unsecured domestic bonds payable [member] | Cost [member] |  |  |
Disclosure of detailed information about bonds [Line Items] |  |  |
Bonds payable | 33,100,000 |  | 23,100,000
Unsecured exchangeable bonds payable [member] | Cost [member] |  |  |
Disclosure of detailed information about bonds [Line Items] |  |  |
Bonds payable | $ 5,757,373 |  | $ 5,757,373

X
- Definition The amount of current bonds issued and the current portion of non-current bonds issued. [Refer: Bonds issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The non-current portion of non-current bonds issued. [Refer: Bonds issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Bonds payable. + References No definition available. + Details
Name: | umc_BondsPayable
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure of detailed information about bonds. + References No definition available. + Details
Name: | umc_DisclosureOfDetailedInformationAboutBondsLineItems
Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=umc_UnsecuredDomesticBondsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=umc_UnsecuredExchangeableBondsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |