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Income Tax - Income Tax Expense (Benefit) Recognized in Other Comprehensive Income (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax
Unrealized gain or loss on available-for-sale financial assets	$ (3)	$ (2)	$ 2
Remeasurement on defined benefit plan	(344)	(347)	(39)
Total income tax benefit recognized in other comprehensive income	$ (347)	$ (349)	$ (37)

X

- 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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X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: 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]]

+ References

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