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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Reclassification Of Financial Assets [Line Items]
Hedging Gain or Loss Recognized in OCI	$ (10)	$ 2	$ (1)
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	(43)	21	(2)
Due to Hedged Future Cash Flows No Longer Expected to Occur	$ 0	$ 0	$ 0

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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

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The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

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

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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]

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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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