XML 47 R30.htm IDEA: XBRL DOCUMENT
v3.25.1

Summary of Material Accounting Policies - Consolidated Entities (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
UMC GROUP (USA) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | IC Sales |
Percentage of ownership | 100.00% | 100.00%
UNITED MICROELECTRONICS (EUROPE) B.V. (UME BV) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Marketing support activities |
Percentage of ownership | 100.00% | 100.00%
UMC CAPITAL CORP. [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
GREEN EARTH LIMITED (GE) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
TLC CAPITAL CO., LTD. (TLC) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Venture capital |
Percentage of ownership | 100.00% | 100.00%
UMC INVESTMENT (SAMOA) LIMITED [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
FORTUNE VENTURE CAPITAL CORP. (FORTUNE) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Consulting and planning for venture capital |
Percentage of ownership | 100.00% | 100.00%
UMC KOREA CO., LTD. (UMC KOREA) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Marketing support activities |
Percentage of ownership | 100.00% | 100.00%
OMNI GLOBAL LIMITED (OMNI) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
SINO PARAGON LIMITED [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
BEST ELITE INTERNATIONAL LIMITED (BE) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC |
Business nature | Sales and manufacturing of integrated circuits |
Percentage of ownership | 100.00% | 100.00%
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UMC and FORTUNE |
Business nature | Sales and manufacturing of integrated circuits |
Percentage of ownership | 79.54% | 80.00%
SOARING CAPITAL CORP. [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | TLC |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
UNITRUTH ADVISOR (SHANGHAI) CO., LTD. [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | SOARING CAPITAL CORP. |
Business nature | Investment holding and advisory |
Percentage of ownership | 100.00% | 100.00%
UNITED MICROCHIP CORPORATION [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | GE |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | FORTUNE |
Business nature | Energy technical services |
Percentage of ownership | 94.93% | 99.01%
EVERRICH ENERGY INVESTMENT (HK) LIMITED (EVERRICH-HK) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | TERA ENERGY |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
EVERRICH (JINING) NEW ENERGY TECHNOLOGY CO., LTD. (formerly EVERRICH (SHANDONG) ENERGY CO., LTD.) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | EVERRICH-HK |
Business nature | Solar engineering integrated design services |
Percentage of ownership | 100.00% | 100.00%
UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | OMNI |
Business nature | Research and development |
Percentage of ownership | 100.00% | 100.00%
ECP VITA PTE. LTD. [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | OMNI |
Business nature | Insurance |
Percentage of ownership | 100.00% | 100.00%
WAVETEK MICROELECTRONICS CORPORATION (USA) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | WAVETEK |
Business nature | Marketing service |
Percentage of ownership | 100.00% | 100.00%
INFOSHINE TECHNOLOGY LIMITED (INFOSHINE) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | BE |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
OAKWOOD ASSOCIATES LIMITED (OAKWOOD) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | INFOSHINE |
Business nature | Investment holding |
Percentage of ownership | 100.00% | 100.00%
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HEJIAN) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | OAKWOOD |
Business nature | Sales and manufacturing of integrated circuits |
Percentage of ownership | 99.9985% | 99.9985%
UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | HEJIAN |
Business nature | Integrated circuits design services |
Percentage of ownership | 0.00% | 100.00%
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] |  |
Disclosure of subsidiaries [line items] |  |
Investor | UNITED MICROCHIP CORPORATION and HEJIAN |
Business nature | Sales and manufacturing of integrated circuits |
Percentage of ownership | 100.00% | 100.00%

X
- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 138 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_138_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Name of investor. + References No definition available. + Details
Name: | umc_NameOfInvestor
Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UMCGroupUSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitedMicroelectronicsEuropeBVUMEBVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UMCCapitalCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_GreenEarthLimitedGEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_TLCCapitalCoLtdTLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UMCInvestmentSamoaLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_FortuneVentureCapitalCorpFORTUNEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UMCKoreaCoLtdUMCKOREAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_OmniGlobalLimitedOMNIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_SinoParagonLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_BestEliteInternationalLimitedBEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitedSemiconductorJapanCoLtdUSJCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_WavetekMicroelectronicsCorporationWAVETEKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_SoaringCapitalCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitruthAdvisorShanghaiCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitedMicrochipCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_TeraEnergyDevelopmentCoLtdTERAENERGYMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_EverrichEnergyInvestmentHKLimitedEVERRICHHKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_EverrichJiningNewEnergyTechnologyCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitedMicrotechnologyCorporationCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_ECPVitaPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_WavetekMicroelectronicsCorporationUSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_InfoshineTechnologyLimitedINFOSHINEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_OakwoodAssociatesLimitedOAKWOODMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_HejianTechnologySuzhouCoLtdHEJIANMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitedDSSemiconductorShandongCoLtdUDSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=umc_UnitedSemiconductorXiamenCoLtdUSCXMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |