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Interest Income - Summary of interest income (Detail) $ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2021 TWD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 TWD ($)
Text Block [Abstract]
Bank deposits	$ 1,339.5		$ 3,372.1
Financial assets at FVTPL			1.7
Financial assets at FVTOCI	1,175.5		1,704.9
Financial assets at amortized cost	374.6		388.7
Interest income	$ 2,889.6	$ 103.5	$ 5,467.4

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

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- Definition

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

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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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- Definition

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