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Hedging Financial Instruments - Summary of Hedging Transaction and Reclassification Affected Comprehensive Income (Details) - Forecast Purchases - forward Exchange Contract [Member] - Cash flow hedges [member] - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Reclassification Of Financial Assets [Line Items]
Hedging Gain or Loss Recognized in OCI	$ (13)	$ 21	$ (10)
Amount of Hedge Ineffectiveness Recognized in Profit or Loss	0	0	0
Line item in which hedge ineffectiveness is included	0	0	0
Amount Reclassified to P/L and the Adjusted Line Item	37	6	(43)
Due to Hedged Future Cash Flows No Longer Expected to Occur	$ 0	$ 0	$ 0

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- Definition

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) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

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The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

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- Definition

The amount of reclassification adjustments on cash flow hedges for which the hedged future cash flows are no longer expected to occur, net of tax. [Refer: Reclassification adjustments on cash flow hedges, net of tax]

+ References

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The amount of financial assets reclassified out of the at fair value through profit or loss category. [Refer: Financial assets at fair value through profit or loss]

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