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Financial Instruments - Foreign Currency Risk Sensitivity Analysis (Detail) - TWD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Profit and loss [Member] | Financial instruments [Member] | USD [Member]
Disclosure of detailed information about financial instruments [Line Items]
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange	$ 51	$ 75	$ 56
Profit and loss [Member] | Financial instruments [Member] | EUR [Member]
Disclosure of detailed information about financial instruments [Line Items]
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange	(30)	(39)	(41)
Profit and loss [Member] | Financial instruments [Member] | SGD [Member]
Disclosure of detailed information about financial instruments [Line Items]
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange	(47)	(69)	(85)
Profit and loss [Member] | Financial instruments [Member] | RMB [Member]
Disclosure of detailed information about financial instruments [Line Items]
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange	6	0	3
Profit and loss [Member] | Derivatives [Member] | EUR [Member]
Disclosure of detailed information about financial instruments [Line Items]
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange	7	3	13
Equity [member] | Derivatives [Member] | EUR [Member]
Disclosure of detailed information about financial instruments [Line Items]
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange	$ 1	$ 22	$ 11

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Change in equity due to risk exposure arises from possible changes in foreign exchange rates.

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- Definition

Change in profit or loss due to risk exposure arises from possible changes in foreign exchange rates.

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