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Income Tax - Income Tax Expense Recognized in Other Comprehensive Income (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax relating to components of other comprehensive income [abstract]
Related to remeasurement of defined benefit obligation	$ 422.1	$ (30.4)	$ 103.3
Related to unrealized gain/loss on investments in equity instruments at FVTOCI	0.6	9.4	91.8
Related to gain/loss on cash flow hedges			0.6
Deferred income tax benefit (expense)	$ 422.7	$ (21.0)	$ 195.7

X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- 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 investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses from investments in equity instruments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 12
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- Definition

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

+ References

No definition available.

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