The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as an asset. [Refer: Hedged items [domain]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2024-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]]

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Hedging Instruments Contract Amount

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Hedging instruments contract amount maturity date.

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Hedging Financial Instruments - Summary of Information Related to Hedges of Interest Rate Risk (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ 5.0	$ 0.1	$ 39.9	$ 0.0
US treasury bonds interest rate futures contracts [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount					$ 40.4	$ 48.6
Maturity	March 2025	March 2025	March 2024
US treasury bonds interest rate futures contracts [member] \| Fair value hedges [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ 174.1		$ 20.5	284.0
FVTOCI [member]
Disclosure of detailed information about financial instruments [line items]
Asset Carrying Amount	3,129.2		3,959.5
Asset Accumulated Amount of Fair Value Hedge Adjustments	(11.0)		43.8
FVTOCI [member] \| Fair value hedges [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ (174.1)		$ (20.5)	$ (284.0)