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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financial assets at fair value through other comprehensive income [abstract] |  |  |
Proceeds from sale of shares | $ 6,190.0 | $ 272.0 | $ 561.6
Unrealized gain (loss) on investments in equity instruments at fair value through other comprehensive income | 3,772.8 | 151.9 | $ 303.3
Cumulative loss allowance for expected credit loss | $ 63.1 | $ 47.3 |

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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 2024-01-01 -Paragraph 17 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17_a&doctype=Standard -URIDate 2024-03-27 + Details
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