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Income Tax - Income Tax Benefit Recognized in Other Comprehensive Income (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax
Remeasurement on defined benefit plan	$ (243)	$ (344)	$ (347)
Change in tax rate	(207)	0	0
Unrealized gain or loss on available-for-sale financial assets	0	(3)	(2)
Total income tax benefit recognized in other comprehensive income	$ (450)	$ (347)	$ (349)

X

- Definition

Income tax relating to change in tax rate included in other comprehensive income.

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
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- Definition

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

+ References

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- References

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X

- 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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