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 [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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 [member]]

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Hedging Instruments Contract Amount

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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, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ (109.6)	$ (3.7)	$ 41.0
Fair value hedges [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ 13.1		$ (2.3)
US treasury bonds interest rate futures contracts [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount				$ 122.2	$ 330.3
Maturity	March 2020	March 2020	March 2019
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	$ (164.7)		$ 11.5
FVTOCI [member]
Disclosure of detailed information about financial instruments [line items]
Asset Carrying Amount	7,364.7		23,229.5
Asset Accumulated Amount of Fair Value Hedge Adjustments	(22.4)		(13.5)
FVTOCI [member] \| Fair value hedges [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ 177.8		$ (13.8)