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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, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items] |  |  |  |
Salaries | $ 38,696,110 |  | $ 44,003,174 | $ 35,195,095
Labor and health insurance | 2,060,096 |  | 1,840,591 | 1,641,494
Pension | 1,700,656 |  | 1,913,828 | 1,658,923
Other employee benefit expenses | 618,610 |  | 538,853 | 480,497
Depreciation | 37,551,088 |  | 41,061,930 | 43,911,464
Amortization | 2,726,481 | $ 89,043 | 2,841,334 | 2,894,942
Operating costs [member] |  |  |  |
Disclosure Of Operating Costs And Expenses [Line Items] |  |  |  |
Salaries | 26,693,905 |  | 30,074,528 | 23,388,888
Labor and health insurance | 1,502,553 |  | 1,368,803 | 1,183,315
Pension | 1,240,577 |  | 1,489,076 | 1,259,044
Other employee benefit expenses | 421,871 |  | 373,739 | 335,829
Depreciation | 36,006,021 |  | 39,305,321 | 42,002,745
Amortization | 1,277,920 |  | 1,470,912 | 834,384
Operating expenses [member] |  |  |  |
Disclosure Of Operating Costs And Expenses [Line Items] |  |  |  |
Salaries | 12,002,205 |  | 13,928,646 | 11,806,207
Labor and health insurance | 557,543 |  | 471,788 | 458,179
Pension | 460,079 |  | 424,752 | 399,879
Other employee benefit expenses | 196,739 |  | 165,114 | 144,668
Depreciation | 1,545,067 |  | 1,756,609 | 1,908,719
Amortization | $ 1,448,561 |  | $ 1,370,422 | $ 2,060,558

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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 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_5&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 9 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_9&doctype=Standard -URIDate 2023-03-23 + Details
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