XML 51 R34.htm IDEA: XBRL DOCUMENT
v3.25.1

Summary of Material Accounting Policies - Intangible Assets - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2024
Software [member] |
Disclosure of initial application of standards or interpretations [line items] |
Estimated useful life of intangible assets | 3 years
Patent and technology license fee [member] | Bottom of range [member] |
Disclosure of initial application of standards or interpretations [line items] |
Estimated useful life of intangible assets | 5 Years
Patent and technology license fee [member] | Top of range [member] |
Disclosure of initial application of standards or interpretations [line items] |
Estimated useful life of intangible assets | 10 years
Others [member] |
Disclosure of initial application of standards or interpretations [line items] |
Estimated useful life of intangible assets | the shorter of the contract term or estimated useful life (3 years)

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

X
- Definition Useful lives of amortisation rates intangible assets other than goodwill. + References No definition available. + Details
Name: | umc_UsefulLivesOfAmortisationRatesIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ifrs-full_TechnologybasedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ifrs-full_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |