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Income Tax - Income Tax Expense Recognized in Other Comprehensive Income (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax benefit (expense)
Related to remeasurement of defined benefit obligation	$ 30.6	$ 126.9	$ 99.3
Related to unrealized gain/loss on available-for-sale financial assets	(2.9)	(61.2)	(16.0)
Related to gain/loss on cash flow hedges	(0.6)
Deferred income tax benefit (expense)	$ 27.1	$ 65.7	$ 83.3

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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Deferred tax income (expense) relating to components of other comprehensive income.

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