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Interest Income - Summary of interest income (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of Interest Income [Abstract]
Bank deposits	$ 2,834.8		$ 5,139.1	$ 11,454.0
Financial assets at FVTPL			2.5	339.5
Financial assets at FVTOCI	2,192.5		3,121.9	3,476.2
Financial assets at amortized cost	681.5		754.9	919.7
Interest income	$ 5,708.8	$ 205.8	$ 9,018.4	$ 16,189.4

X

- Definition

The amount of revenue arising from interest for financial assets that are measured at amortised cost. [Refer: Interest income; Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2021-01-01
-Paragraph 20
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- Definition

The amount of interest income on deposits. [Refer: Interest income]

+ References

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-IssueDate 2021-01-01
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- Definition

The amount of interest income on financial assets designated at fair value through profit or loss. [Refer: Interest income; Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently]

+ References

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- Definition

The amount of interest revenue arising on financial assets measured at fair value through other comprehensive income. [Refer: Revenue; Financial assets measured at fair value through other comprehensive income]

+ References

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-Name IFRS
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-IssueDate 2021-01-01
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X

- Definition

The amount of income arising from interest.

+ References

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-IssueDate 2021-01-01
-Paragraph 23
-Subparagraph c
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