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Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financial assets at fair value through other comprehensive income [abstract] |  |  |
Proceeds from sale of shares | $ 272.0 | $ 561.6 | $ 628.7
Unrealized gain (loss) on investments in equity instruments at fair value through other comprehensive income | 151.9 | 303.2 | $ 186.0
Cumulative loss allowance for expected credit loss | $ 47.3 | $ 37.8 |

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- Definition The cash inflow from issuing shares. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17_a&doctype=Standard -URIDate 2023-03-23 + Details
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