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) - 12 months ended Dec. 31, 2018 $ in Millions	TWD ($)	USD ($)	USD ($)
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ 41.0	$ 1,300,000
Fair value hedges [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ (2.3)
US treasury bonds interest rate futures contracts [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount			$ 330.3
Maturity	March 2019	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	$ 11.5
FVTOCI [member]
Disclosure of detailed information about financial instruments [line items]
Asset Carrying Amount	23,229.5
Asset Accumulated Amount of Fair Value Hedge Adjustments	(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	$ (13.8)