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Contents of Significant Accounts - Components of Other Comprehensive Income (Loss) (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Statement of changes in equity [abstract] |  |  |  |
Remeasurements of defined benefit pension plans, Arising during the period | $ 402,234 | $ 13,136 | $ 296,804 | $ (197,477)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Arising during the period | 5,530,359 | 180,612 | (4,646,064) | 5,811,342
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Arising during the period | 1,610,116 | 52,584 | (1,694,965) | 2,959,130
Exchange differences on translation of foreign operations, Arising during the period | (2,386,278) |  | 9,292,308 | (4,743,299)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Arising during the period | (73,005) |  | 91,442 | (24,018)
Total other comprehensive income (loss), Arising during the period | 5,083,426 |  | 3,339,525 | 3,805,678
Exchange differences on translation of foreign operations, Reclassification adjustments during the period | 0 |  | 0 | 2,283
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Reclassification adjustments during the period | (1,413) |  | 0 | (394)
Total other comprehensive income (loss), Reclassification adjustments during the period | (1,413) |  | 0 | 1,889
Remeasurements of defined benefit pension plans, Before tax | 402,234 | 13,136 | 296,804 | (197,477)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Before tax | 5,530,359 |  | (4,646,064) | 5,811,342
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Before tax | 1,610,116 | 52,584 | (1,694,965) | 2,959,130
Exchange differences on translation of foreign operations, Before tax | (2,386,278) | (77,932) | 9,292,308 | (4,741,016)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Before tax | (74,418) | (2,430) | 91,442 | (24,412)
Total other comprehensive income (loss), Before tax | 5,082,013 |  | 3,339,525 | 3,807,567
Remeasurements of defined benefit pension plans, Income tax effect | (80,447) |  | (59,361) | 39,495
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Income tax effect | (243,057) |  | (71,121) | (360,061)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Income tax effect | (90,891) |  | 123,483 | (96,510)
Exchange differences on translation of foreign operations, Income tax effect | 386,660 |  | 883,238 | 23,175
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Income tax effect | 3,768 |  | (23,672) | 6,763
Total other comprehensive income (loss), Income tax effect | (23,967) |  | 852,567 | (387,138)
Remeasurements of defined benefit pension plans, Net of tax | 321,787 |  | 237,443 | (157,982)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Net of tax | 5,287,302 |  | (4,717,185) | 5,451,281
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Net of tax | 1,519,225 |  | (1,571,482) | 2,862,620
Exchange differences on translation of foreign operations, Net of tax | (1,999,618) |  | 10,175,546 | (4,717,841)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Net of tax | (70,650) |  | 67,770 | (17,649)
Total other comprehensive income (loss) | $ 5,058,046 | $ 165,188 | $ 4,192,092 | $ 3,420,429

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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, before tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Other comprehensive income, before reclassification and tax. + References No definition available. + Details
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- Definition Reclassification adjustments on other comprehensive income before tax. + References No definition available. + Details
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- Definition Share of other comprehensive income of associates and joint ventures accounted for using equity method before reclassification to profit or loss, before tax. + References No definition available. + Details
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- Definition Share of other comprehensive income of associates and joint ventures accounted for using equity method reclassified to profit or loss, before tax. + References No definition available. + Details
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