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Hedging Financial Instruments - Summary of hedging financial instruments (Detail) - TWD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets- current |  |
Financial assets current | $ 2.3 | $ 13.5
Fair value hedges [member] | Interest rate futures contracts [member] |  |
Financial assets- current |  |
Financial assets current | 2.3 |
Financial liabilities- current |  |
Financial liabilities current | $ 0.8 | 9.6
Cash flow hedges [member] | Forward Interest Rate Contracts [Member] |  |
Financial assets- current |  |
Financial assets current |  | $ 13.5

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