XML 100 R83.htm IDEA: XBRL DOCUMENT
v3.25.1

Contents of Significant Accounts - Summary of Disaggregation of Revenue by Geography (Detail) - TWD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | $ 232,302,584 | $ 222,533,000 | $ 278,705,264
Taiwan [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | 83,758,430 | 68,360,231 | 105,213,451
China (includes Hong Kong) [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | 37,117,309 | 27,545,452 | 39,641,613
Japan [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | 9,107,394 | 11,612,866 | 17,053,279
Korea [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | 26,295,063 | 30,872,198 | 25,689,385
USA [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | 58,117,650 | 59,103,051 | 67,352,671
Europe [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | 17,902,262 | 24,932,099 | 23,711,284
Others [member] |  |  |
Disclosure of Geographical Areas [Line Items] |  |  |
Revenue from contracts with customers | $ 4,476 | $ 107,103 | $ 43,581

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

X
- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_TW
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=umc_ChinaIncludesHongKongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_JP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_KR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=umc_Europe1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=umc_AllOtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |