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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, 2019 | Dec. 31, 2018
Financial assets at fair value through other comprehensive income [abstract] |  |
Proceeds from sale of shares | $ 873.5 | $ 840.6
Unrealized gain (loss) on investments in equity instruments at fair value through other comprehensive income | 156.8 | 1,193.1
Cumulative loss allowance for expected credit loss | $ 35.6 | $ 29.7

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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 2019-01-01 -Paragraph 17 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Unrealized gains/losses on equity securities at fair value through other comprehensive income + References No definition available. + Details
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