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Contents Of Significant Accounts - Equity Settled Share Based Payment Of Restricted Stock Plans For Employees (Detail) - Restricted Stock Plan For Employees [Member] shares in Thousands | 12 Months Ended
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Dec. 31, 2024 $ / shares shares
2024 Plan [Member] | 1st Tranche [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Resolution date of UMC's shareholders meeting | May 30, 2024
Maximum shares to be issued (in thousands) | 66,000
Eligible employees | Qualified employees of the Company
Issuance of shares (in thousands) | 32,956
Issuance date | December 5, 2024
Weighted-average fair value on the grant date (NT$/ per share) | $ / shares | $ 39.27
2022 Plan [Member] | 1st Tranche [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Eligible employees | Qualified employees of the Company
Issuance of shares (in thousands) | 23,060
Issuance date | December 5, 2022
Weighted-average fair value on the grant date (NT$/ per share) | $ / shares | $ 44.4
2022 Plan [Member] | 2nd Tranche [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Resolution date of UMC's shareholders meeting | May 27, 2022
Maximum shares to be issued (in thousands) | 50,000
Issuance of shares (in thousands) | 26,728
Issuance date | December 5, 2023
Weighted-average fair value on the grant date (NT$/ per share) | $ / shares | $ 48.9
2020 Plan [Member] | 1st Tranche [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Eligible employees | Qualified employees of UMC
Issuance of shares (in thousands) | 200,030
Issuance date | September 1, 2020
Weighted-average fair value on the grant date (NT$/ per share) | $ / shares | $ 21.8
2020 Plan [Member] | 2nd Tranche [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Resolution date of UMC's shareholders meeting | Jun. 10, 2020
Maximum shares to be issued (in thousands) | 233,200
Issuance of shares (in thousands) | 1,268
Issuance date | June 9, 2021
Weighted-average fair value on the grant date (NT$/ per share) | $ / shares | $ 53

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- Definition The date on which share-based payment arrangements are granted. [Refer: Types of share-based payment arrangements [domain]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph IG23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_IG23&doctype=Implementation%20Guidance -URIDate 2024-03-27 + Details
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- 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
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- Definition The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Description Of Eligible Employees. + References No definition available. + Details
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- Definition Maximum shares to be issued under compensation plan. + References No definition available. + Details
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- Definition Resolution Date Of Shareholders Meeting. + References No definition available. + Details
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- Definition Shares of restricted stock for employees issued. + References No definition available. + Details
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- Details
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- Details
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- Details
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