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Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	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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- References

No definition available.

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- Definition

The cash inflow from issuing shares.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph a
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-URIDate 2019-03-27

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- Definition

Cumulative loss allowance for expected credit loss at fair value through other comprehensive income.

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No definition available.

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- Definition

Unrealized gains/losses on equity securities at fair value through other comprehensive income

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No definition available.

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