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Interest Income - Summary of interest income (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Text Block [Abstract]
Bank deposits	$ 5,139.1		$ 11,454.0	$ 10,310.7
Financial assets at FVTPL	2.5		339.5	382.7
Financial assets at FVTOCI	3,121.9		3,476.2	3,078.6
Financial assets at amortized cost	754.9		919.7	922.4
Interest income	$ 9,018.4	$ 321.2	$ 16,189.4	$ 14,694.4

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]

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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]

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- Definition

The amount of income arising from interest.

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