XML 90 R74.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Contents of Significant Accounts - Details of Distribution (Detail) - TWD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of equity [Line Items] |  |  |
Appropriation of earnings, Cash dividends | $ 45,017,096 |  | $ 19,875,842
Cash dividends | $ 3 | $ 3.6 |
Legal Reserve [Member] |  |  |
Disclosure of equity [Line Items] |  |  |
Appropriation of earnings | $ 6,255,736 | $ 8,905,139 |
Special Reserve [member] |  |  |
Disclosure of equity [Line Items] |  |  |
Appropriation of earnings | (2,734,057) | (2,180,156) |
Cash dividends [member] |  |  |
Disclosure of equity [Line Items] |  |  |
Appropriation of earnings, Cash dividends | $ 37,587,102 | $ 45,017,096 |

X
- Definition The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in equity resulting from transfers to a statutory reserve. [Refer: Statutory reserve] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransferToStatutoryReserve
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash dividends declared per share. + References No definition available. + Details
Name: | umc_CashDividendsDeclaredPerShare
Namespace Prefix: | umc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of equity [Line Items] + References No definition available. + Details
Name: | umc_DisclosureOfEquityLineItems
Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Special reserve from appropriation of earnings. + References No definition available. + Details
Name: | umc_SpecialReserveFromAppropriationOfEarnings
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=umc_LegalReserve1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=umc_SpecialReserveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=umc_CashDividendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |