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Hedging Derivative Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Detailed Information About Hedging Instruments [Abstract]
Gains (losses) on change in value of forward elements of forward contracts, net of tax	$ 1	$ 1
Reclassification of gain (loss) arising from forward exchange contracts	$ 2	$ 1	$ (1)

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- References

No definition available.

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- Definition

The gains (losses) recognised in other comprehensive income on change in value of forward elements of forward contracts, net of tax. [Refer: Other comprehensive income]

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- Definition

The amount of reclassification adjustments related to change in value of forward elements of forward contracts, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income]

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