XML 23 R6.htm IDEA: XBRL DOCUMENT
v3.25.1

Consolidated Statements of Cash Flows $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Cash flows from operating activities: |  |  |  |
Net income before tax | $ 57,044,820 | $ 1,739,702 | $ 68,450,404 | $ 109,625,660
Adjustments to reconcile net income before tax to net cash provided by operating activities: |  |  |  |
Depreciation | 45,472,102 | 1,386,767 | 37,757,556 | 41,328,374
Amortization | 2,695,564 | 82,207 | 2,726,481 | 2,841,334
Expected credit impairment losses (gains) | (69,519) | (2,120) | (130,518) | 2,723
Net loss of financial assets and liabilities at fair value through profit or loss | 320,956 | 9,788 | 40,553 | 1,247,962
Interest expense | 1,678,702 | 51,196 | 1,473,729 | 1,785,311
Interest income | (3,670,218) | (111,931) | (4,853,124) | (2,022,314)
Dividend income | (1,202,714) | (36,679) | (1,773,498) | (2,163,043)
Share-based payment | 788,849 | 24,058 | 1,031,896 | 1,351,738
Share of profit of associates and joint ventures | (1,238,628) | (37,775) | (4,307,614) | (1,626,103)
Gain on disposal of property, plant and equipment | (72,402) | (2,208) | (268,293) | (482,983)
Gain on disposal of subsidiary | (352) | (11) | 0 | 0
Loss (gain) on disposal of investments accounted for under the equity method | 2,093 | 64 | (163,395) | (50,553)
Loss on repurchases of bonds | 0 | 0 | 0 | 203,851
Exchange loss on financial assets and liabilities | 1,331,907 | 40,619 | 85,353 | 2,436,159
Bargain purchase gain in acquisition of equity investee | 0 | 0 | (494,001) | 0
Gain on lease modification | (8,599) | (262) | (113) | (1,162)
Amortization of deferred government grants | (841,091) | (25,651) | (2,663,843) | (4,163,746)
Income and expense adjustments | 45,186,650 | 1,378,062 | 28,461,169 | 40,687,548
Changes in operating assets and liabilities: |  |  |  |
Financial assets and liabilities at fair value through profit or loss | (543,068) | (16,562) | 1,945,525 | 14,825
Contract assets | 110,439 | 3,368 | (381,105) | (47,842)
Notes receivable and accounts receivable | (3,269,237) | (99,702) | 7,201,939 | (1,115,482)
Other receivables | 662,553 | 20,206 | (526,223) | (914,736)
Inventories | 365,305 | 11,141 | (4,944,756) | (7,637,528)
Other current assets | 192,256 | 5,863 | 939,912 | (4,041,038)
Contract fulfillment costs | 303,311 | 9,250 | (164,316) | (97,027)
Contract liabilities | (599,528) | (18,284) | (267,858) | (252,594)
Accounts payable | 14,590 | 445 | (1,341,114) | 490,949
Other payables | (1,173,347) | (35,784) | (5,683,081) | 9,230,484
Other current liabilities | 1,056,250 | 32,213 | 1,470,483 | 791,279
Net defined benefit liabilities | (584,384) | (17,822) | (262,084) | (711,115)
Other noncurrent liabilities | (4,947) | (151) | (89,593) | (8,039)
Cash generated from operations | 98,761,663 | 3,011,945 | 94,809,302 | 146,015,344
Interest received | 4,151,879 | 126,620 | 4,579,972 | 1,852,783
Dividend received | 2,274,607 | 69,369 | 3,649,805 | 4,132,529
Interest paid | (1,339,730) | (40,858) | (1,027,500) | (1,422,337)
Income tax paid | (9,976,377) | (304,251) | (16,011,870) | (4,717,790)
Net cash provided by operating activities | 93,872,042 | 2,862,825 | 85,999,709 | 145,860,529
Cash flows from investing activities: |  |  |  |
Acquisition of financial assets at fair value through profit or loss | (1,894,858) | (57,788) | (1,182,248) | (1,041,792)
Proceeds from disposal of financial assets at fair value through profit or loss | 989,051 | 30,163 | 525,237 | 773,318
Acquisition of financial assets at fair value through other comprehensive income or loss | (64,694) | (1,973) | 0 | 0
Acquisition of financial assets measured at amortized cost | (4,167,692) | (127,102) | (6,296,321) | (1,682,788)
Proceeds from redemption of financial assets measured at amortized cost | 6,702,256 | 204,399 | 678,907 | 30,179,933
Acquisition of investments accounted for under the equity method | (533,973) | (16,285) | 0 | 0
Proceeds from disposal of investments accounted for under the equity method | 0 | 0 | 293,266 | 0
Proceeds from capital reduction of investments accounted for under the equity method | 1,601,874 | 48,853 | 1,303,106 | 0
Increase in prepayment for investments | (7,135) | (217) | 0 | 0
Disposal of subsidiary | (196,009) | (5,978) | 0 | 0
Acquisition of property, plant and equipment | (88,543,595) | (2,700,323) | (91,473,668) | (80,127,628)
Proceeds from disposal of property, plant and equipment | 120,939 | 3,688 | 323,385 | 669,282
Increase in refundable deposits | (769,153) | (23,457) | (44,100) | (558,491)
Decrease in refundable deposits | 1,519,269 | 46,333 | 83,856 | 186,175
Acquisition of intangible assets | (2,799,420) | (85,374) | (2,546,516) | (2,756,155)
Government grants related to assets acquisition | 2,131,264 | 64,997 | 591,086 | 173,909
Increase in other noncurrent assets | (29,227) | (891) | (42,532) | (243,084)
Decrease in other noncurrent assets | 0 | 0 | 0 | 55
Net cash used in investing activities | (85,941,103) | (2,620,955) | (97,786,542) | (54,427,266)
Cash flows from financing activities: |  |  |  |
Increase in short-term loans | 30,683,900 | 935,770 | 29,120,960 | 228,980
Decrease in short-term loans | (35,698,900) | (1,088,713) | (15,590,960) | (2,194,664)
Cash payments for the principal portion of the lease liability | (731,138) | (22,298) | (666,439) | (712,854)
Proceeds from bonds issued | 0 | 0 | 10,000,000 | 0
Bonds issuance costs | (465) | (14) | (10,755) | 0
Redemption of bonds | (8,500,000) | (259,225) | 0 | (13,305,050)
Proceeds from long-term loans | 36,286,030 | 1,106,619 | 15,416,130 | 2,319,371
Repayments of long-term loans | (23,107,596) | (704,715) | (11,558,426) | (21,135,630)
Increase in guarantee deposits | 68,041 | 2,075 | 11,651,109 | 15,823,396
Decrease in guarantee deposits | (640,362) | (19,529) | (1,227,764) | (838,455)
Decrease in other financial liabilities | 0 | 0 | (21,209,443) | 0
Cash dividends and cash distributed from additional paid-in capital | (37,585,606) | (1,146,252) | (45,014,783) | (37,445,300)
Change in non-controlling interests | 26,349 | 803 | 4,187 | 5,456
Net cash used in financing activities | (39,199,747) | (1,195,479) | (29,086,184) | (57,254,750)
Effect of exchange rate changes on cash and cash equivalents | 3,715,419 | 113,310 | (392,145) | 7,018,133
Net increase (decrease) in cash and cash equivalents | (27,553,389) | (840,299) | (41,265,162) | 41,196,646
Cash and cash equivalents at beginning of year | 132,553,615 | 4,042,502 | 173,818,777 | 132,622,131
Cash and cash equivalents at end of year | $ 105,000,226 | $ 3,202,203 | $ 132,553,615 | $ 173,818,777

X
- Definition Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForDecreaseIncreaseInInventories
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for decrease (increase) in other current assets to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other current assets; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for decrease (increase) in other operating receivables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for fair value losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForFairValueGainsLosses
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for increase (decrease) in employee benefit liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for increase (decrease) in other current liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other current liabilities; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for increase (decrease) in other operating payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for increase (decrease) in trade accounts payable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for interest expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Interest expense; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForInterestExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for interest income expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Interest income; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForInterestIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_AdjustmentsForReconcileProfitLossAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Adjustments for share-based payments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForSharebasedPayments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments, other than changes in working capital, to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AmortisationExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity, from continuing and discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 50 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_50_d&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashFlowsFromUsedInFinancingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents, from continuing and discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 50 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_50_d&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashFlowsFromUsedInInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities, from continuing and discontinued operations. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 50 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_50_d&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashFlowsFromUsedInOperatingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash from (used in) the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashFlowsFromUsedInOperations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_75_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DepreciationPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from dividends received, classified as operating activities. [Refer: Dividends received] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 31 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_31&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DividendsReceivedClassifiedAsOperatingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The effect of exchange rate changes on cash and cash equivalents held or due in a foreign currency. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 28 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_28&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 98 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_98_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_GainsOnDisposalsOfPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash flows from income taxes paid or refunded, classified as operating activities. [Refer: Income taxes paid (refund)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 14 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_14_f&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in cash and cash equivalents after the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInCashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in contract assets resulting from cumulative catch-up adjustments to revenue. [Refer: Contract assets; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_118_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_118_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for interest paid, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 31 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_31&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_InterestPaidClassifiedAsOperatingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from interest received, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 31 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_31&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_InterestReceivedClassifiedAsOperatingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for debt issue costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PaymentsForDebtIssueCosts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17_e&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from current borrowings obtained. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromCurrentBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from government grants, classified as investing activities. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 20 -IssueDate 2024-01-01 -Paragraph 28 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=20&code=ifrs-tx-2024-en-r&anchor=para_28&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromGovernmentGrantsClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the issuing of bonds, notes and debentures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from non-current borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromNoncurrentBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from sales of long-term assets that the entity does not separately disclose in the same statement or note, classified as investing activities. [Refer: Assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromOtherLongtermAssetsClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from sales of investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The profit (loss) before tax expense or income. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2024-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2024-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_103&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProfitLossBeforeTax
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for the purchase of financial instruments. [Refer: Classes of financial instruments [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for the purchases of intangible assets, classified as investing activities. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for the purchases of long-term assets that the entity does not separately disclose in the same statement or note, classified as investing activities. [Refer: Assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for repayments of bonds, notes and debentures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RepaymentsOfBondsNotesAndDebentures
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for repayments of current borrowings. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RepaymentsOfCurrentBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for repayments of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RepaymentsOfNoncurrentBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RevenueFromDividends
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_g&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for the purchase of financial assets measured at amortized cost. + References No definition available. + Details
Name: | umc_AcquisitionOfFinancialAssetsMeasuredAtAmortizedCost
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Adjustments for decrease (increase) in financial assets and liabilities at fair value through profit or loss. + References No definition available. + Details
Name: | umc_AdjustmentsForDecreaseIncreaseInFinancialAssetsAndLiabilitiesAtFairValueThroughProfitOrLoss
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for decrease increase in notes and accounts receivable + References No definition available. + Details
Name: | umc_AdjustmentsForDecreaseIncreaseInNotesAndAccountsReceivable
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for exchange loss (gain) on financial assets and liabilities. + References No definition available. + Details
Name: | umc_AdjustmentsForExchangeLossGainOnFinancialAssetsAndLiabilities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Adjustments for increase (decrease) in contract fulfillment costs. + References No definition available. + Details
Name: | umc_AdjustmentsForIncreaseDecreaseInContractFulfillmentCosts
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for increase (decrease) in other non-current liabilities. + References No definition available. + Details
Name: | umc_AdjustmentsForIncreaseDecreaseInOtherNoncurrentLiabilities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments for loss on repurchase of bonds. + References No definition available. + Details
Name: | umc_AdjustmentsForLossOnRepurchaseOfBonds
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization of deferred government grants. + References No definition available. + Details
Name: | umc_AmortizationOfDeferredGovernmentGrants
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of bargain purchase​ gain in acquisition of equity investee. + References No definition available. + Details
Name: | umc_BargainPurchaseGainInAcquisitionOfEquityInvestee
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash dividends and cash distributed from additional paid in capital. + References No definition available. + Details
Name: | umc_CashDividendsAndCashDistributedFromAdditionalPaidInCapital
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Change in noncontrolling interest classified as financing activities. + References No definition available. + Details
Name: | umc_ChangeInNoncontrollingInterestClassifiedAsFinancingActivities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Changes in operating assets and liabilities. + References No definition available. + Details
Name: | umc_ChangesInOperatingAssetsAndLiabilitiesAbstract
Namespace Prefix: | umc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for decrease in guarantee deposits. + References No definition available. + Details
Name: | umc_DecreaseInGuaranteeDeposits
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Decrease in other financial liabilities classified as financing activities. + References No definition available. + Details
Name: | umc_DecreaseInOtherFinancialLiabilitiesClassifiedAsFinancingActivities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from decrease in refundable deposits. + References No definition available. + Details
Name: | umc_DecreaseInRefundableDeposits
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expected credit impairment loss (gains). + References No definition available. + Details
Name: | umc_ExpectedCreditImpairmentLossGains
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gains on disposals of subsidiary. + References No definition available. + Details
Name: | umc_GainsOnDisposalsOfSubsidiary
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from increase in guarantee deposits. + References No definition available. + Details
Name: | umc_IncreaseInGuaranteeDeposits
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for increase in refundable deposits. + References No definition available. + Details
Name: | umc_IncreaseInRefundableDeposits
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss (gain) on disposal of investments accounted for under the equity method. + References No definition available. + Details
Name: | umc_LossGainOnDisposalOfInvestmentsAccountedForUnderTheEquityMethod
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The loss (gain) on lease modification. + References No definition available. + Details
Name: | umc_LossGainOnLeaseModification
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net cash flows from losing control of subsidiaries or businesses classified as investing activities. + References No definition available. + Details
Name: | umc_NetCashFlowsFromLosingControlOfSubsidiariesOrBusinessesClassifiedAsInvestingActivities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from capital reduction of investments accounted for under the equity method. + References No definition available. + Details
Name: | umc_ProceedsFromCapitalReductionOfInvestmentsAccountedForUnderTheEquityMethod
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the disposal of financial assets at fair value through profit or loss. + References No definition available. + Details
Name: | umc_ProceedsFromDisposalOfFinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from redemption of financial assets measured at amortized cost classified as investing activities. + References No definition available. + Details
Name: | umc_ProceedsFromRedemptionOfFinancialAssetsMeasuredAtAmortizedCostClassifiedAsInvestingActivities
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for the purchase of financial assets at fair value through profit or loss. + References No definition available. + Details
Name: | umc_PurchaseOfFinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition PurchaseOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeOrLoss + References No definition available. + Details
Name: | umc_Purchaseoffinancialassetsatfairvaluethroughothercomprehensiveincomeorloss
Namespace Prefix: | umc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration