XML 128 R111.htm IDEA: XBRL DOCUMENT
v3.25.1

Financial Risk and Fair Value Disclosures - Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity (Detail) - TWD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Short-term loans | $ 8,683,215 | $ 13,780,612
Payables | 42,136,632 | 52,202,821
Guarantee deposits | 42,874,494 | 41,599,386
Bonds payable | 31,281,434 | 40,232,586
Long-term loans | 39,416,145 | 25,290,536
Lease liabilities | 8,220,632 | 6,897,571
Total | 172,612,552 | 180,003,512
Net settlement-outflow | (1,039) |
Not later than one year [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Short-term loans | 8,683,215 | 13,780,612
Payables | 42,136,632 | 52,202,821
Guarantee deposits | 921,134 | 1,476,430
Bonds payable | 340,976 | 14,797,772
Long-term loans | 6,354,561 | 2,872,168
Lease liabilities | 830,618 | 649,879
Total | 59,267,136 | 85,779,682
Net settlement-outflow | (1,039) |
Later than two years and not later than three years [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Short-term loans | 0 | 0
Payables | 0 | 0
Guarantee deposits | 4,571,633 | 3,556,179
Bonds payable | 16,675,030 | 10,980,506
Long-term loans | 11,490,087 | 14,406,101
Lease liabilities | 1,509,438 | 1,311,239
Total | 34,246,188 | 30,254,025
Net settlement-outflow | 0 |
Later than four years and not later than five years [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Short-term loans | 0 | 0
Payables | 0 | 0
Guarantee deposits | 27,522,150 | 25,955,654
Bonds payable | 12,146,745 | 12,321,345
Long-term loans | 21,478,391 | 5,071,743
Lease liabilities | 1,437,870 | 1,223,724
Total | 62,585,156 | 44,572,466
Net settlement-outflow | 0 |
Later than five years [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Short-term loans | 0 | 0
Payables | 0 | 0
Guarantee deposits | 9,859,577 | 10,611,123
Bonds payable | 2,118,683 | 2,132,963
Long-term loans | 93,106 | 2,940,524
Lease liabilities | 4,442,706 | 3,712,729
Total | 16,514,072 | $ 19,397,339
Net settlement-outflow | $ 0 |

X
- Definition The amount of contractual undiscounted cash flows in relation to bonds issued. [Refer: Bonds issued] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph IG31A -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph B11D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B11D&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
Name: | ifrs-full_BondsIssuedUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to net amounts for pay-floating (receive-fixed) interest rate swaps for which net cash flows are exchanged. [Refer: Swap contract [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph B11D -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B11D_c&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
Name: | ifrs-full_NetAmountsForPayfloatingReceivefixedInterestRateSwapsForWhichNetCashFlowsAreExchanged
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 39 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_39_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph IG31A -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph B11D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B11D&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
Name: | ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure of maturity analysis for non-derivative and derivative financial liabilities. + References No definition available. + Details
Name: | umc_DisclosureOfMaturityAnalysisForNonderivativeAndDerivativeFinancialLiabilitiesLineItems
Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of contractual undiscounted cash flows in relation to guarantee deposits. + References No definition available. + Details
Name: | umc_GuaranteeDepositsUndiscountedCashFlows
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lease Liabilities Undiscounted Cash Flows. + References No definition available. + Details
Name: | umc_LeaseLiabilitiesUndiscountedCashFlows
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to long-term loans. + References No definition available. + Details
Name: | umc_LongtermLoansUndiscountedCashFlows
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to short-term loans. + References No definition available. + Details
Name: | umc_ShorttermLoansUndiscountedCashFlows
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |