XML 113 R97.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Significant Related Party Transactions - Significant Intercompany Transactions Between Consolidated Entities (Detail) $ in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Amount of downstream transaction |  | $ 350 |  | $ 350 |  | $ 350
UMC GROUP (USA) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 61,923,652 |  | $ 68,554,072 |  | $ 48,440,369 |
Accounts receivable | $ 5,827,800 |  | $ 9,502,922 |  | $ 6,286,428 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 1,127,275 |  | $ 1,143,280 |  | $ 1,222,320 |
Accounts receivable | $ 11,688 |  | $ 16,774 |  | $ 29,012 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 30 days | Net 30 days | Net 30 days | Net 30 days | Net 30 days | Net 30 days
UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 364,948 |  | $ 656,472 |  | $ 178,331 |
Accounts receivable | $ 10,800 |  | $ 6,734 |  | $ 18,818 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 30 days | Net 30 days | Net 30 days | Net 30 days | Net 30 days | Net 30 days
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) (WTK) [member] | UMC GROUP (USA) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 505,806 |  | $ 716,357 |  | $ 545,785 |
Accounts receivable | $ 53,916 |  | $ 81,819 |  | $ 126,580 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK) (WTK) [member] | UMC [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales |  |  | $ 124,178 |  | $ 110,620 |
Explanation of terms and conditions of outstanding balances for related party transaction |  |  | Month-end 30 days | Month-end 30 days | Month-end 30 days | Month-end 30 days
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member] | UMC GROUP (USA) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 384,067 |  | $ 551,913 |  | $ 366,968 |
Accounts receivable | $ 43,863 |  | $ 147,265 |  | $ 60,147 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member] | UDS [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 159,523 |  | $ 311,972 |  |  |
Accounts receivable | $ 2,696 |  | $ 9,500 |  |  |
Explanation of terms and conditions of outstanding balances for related party transaction | Month-end 30 days | Month-end 30 days | Month-end 30 days | Month-end 30 days |  |
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] | UMC GROUP (USA) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 1,208,630 |  | $ 1,565,670 |  | $ 1,444,736 |
Accounts receivable | $ 17,816 |  | $ 310,431 |  | $ 221,375 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] | UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 286,087 |  | $ 148,259 |  |  |
Accounts receivable | $ 362 |  | $ 171 |  |  |
Explanation of terms and conditions of outstanding balances for related party transaction | Month-end 30 days | Month-end 30 days | Month-end 30 days | Month-end 30 days |  |
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM) [member] | UMC [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 134,303 |  | $ 1,035,407 |  |  |
Accounts receivable |  |  | $ 173 |  |  |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 30 days - Net 45 days | Net 30 days - Net 45 days | Net 30 days - Net 45 days | Net 30 days - Net 45 days |  |
UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales |  |  | $ 164,855 |  |  |
Accounts receivable |  |  | $ 151,430 |  |  |
Explanation of terms and conditions of outstanding balances for related party transaction |  |  | Net 60 days | Net 60 days |  |
UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC) [member] | UMC GROUP (USA) [member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Sales | $ 3,487,292 |  | $ 4,272,900 |  | $ 2,917,993 |
Accounts receivable | $ 342,835 |  | $ 744,082 |  | $ 428,363 |
Explanation of terms and conditions of outstanding balances for related party transaction | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days | Net 60 days

X
- Definition The amounts receivable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2023-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_20&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2023-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_18_b&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_AmountsReceivableRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The explanation of the terms and conditions of outstanding balances for related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2023-01-01 -Paragraph 18 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_18_b_i&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ExplanationOfTermsAndConditionsOfOutstandingBalancesForRelatedPartyTransaction
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2023-01-01 -Paragraph 21 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_21_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of transfers under licence agreements from the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2023-01-01 -Paragraph 21 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_21_f&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_TransfersUnderLicenseAgreementsFromEntityRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | ifrs-full_CounterpartiesAxis=umc_UnitedDSSemiconductorShandongCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_CounterpartiesAxis=umc_UMCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=umc_HejianTechnologySuzhouCoLtdHJMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=umc_UdsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=umc_UnitedSemiconductorXiamenCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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