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Contents of Significant Accounts - Operating Costs and Expenses (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items] |  |  |  |
Salaries | $ 37,444,947 |  | $ 38,696,110 | $ 44,003,174
Labor and health insurance | 1,910,169 |  | 2,060,096 | 1,840,591
Pension | 2,013,217 |  | 1,700,656 | 1,913,828
Other employee benefit expenses | 609,254 |  | 618,610 | 538,853
Depreciation | 45,336,692 |  | 37,551,088 | 41,061,930
Amortization | 2,695,564 | $ 82,207 | 2,726,481 | 2,841,334
Operating costs [member] |  |  |  |
Disclosure Of Operating Costs And Expenses [Line Items] |  |  |  |
Salaries | 25,959,209 |  | 26,693,905 | 30,074,528
Labor and health insurance | 1,383,016 |  | 1,502,553 | 1,368,803
Pension | 1,511,302 |  | 1,240,577 | 1,489,076
Other employee benefit expenses | 401,329 |  | 421,871 | 373,739
Depreciation | 43,740,758 |  | 36,006,021 | 39,305,321
Amortization | 1,041,562 |  | 1,277,920 | 1,470,912
Operating expenses [member] |  |  |  |
Disclosure Of Operating Costs And Expenses [Line Items] |  |  |  |
Salaries | 11,485,738 |  | 12,002,205 | 13,928,646
Labor and health insurance | 527,153 |  | 557,543 | 471,788
Pension | 501,915 |  | 460,079 | 424,752
Other employee benefit expenses | 207,925 |  | 196,739 | 165,114
Depreciation | 1,595,934 |  | 1,545,067 | 1,756,609
Amortization | $ 1,654,002 |  | $ 1,448,561 | $ 1,370,422

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- 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
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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible 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
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- Definition The amount of expense arising from purchased insurance. + 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
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- Definition The amount of employee expenses that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_5&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 9 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_9&doctype=Standard -URIDate 2024-03-27 + Details
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