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: