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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Product (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Products [Line Items] |  |  |
Revenue from contracts with customers | $ 222,533,000 | $ 278,705,264 | $ 213,011,018
Wafer [member] |  |  |
Disclosure Of Products [Line Items] |  |  |
Revenue from contracts with customers | 211,750,622 | 265,600,173 | 204,594,399
Other products [member] |  |  |
Disclosure Of Products [Line Items] |  |  |
Revenue from contracts with customers | $ 10,782,378 | $ 13,105,091 | $ 8,416,619

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- 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 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of products. + References No definition available. + Details
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Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=umc_OtherProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |