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Income Tax - Income Tax Recognized in Other Comprehensive Income (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax
Remeasurement on defined benefit pension plans	$ 78	$ 239	$ 305
Exchange differences arising from the translation of the foreign operations	0	0	0
Total income tax expense recognized in other comprehensive income	$ 78	$ 239	$ 305

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 exchange differences on translation of the financial statements of a parent company or a stand-alone entity to a different presentation currency. [Refer: Other comprehensive income; Reserve of exchange differences on translation]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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