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Investment Properties - Key Assumptions and Fair Values of Investment Properties (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of detailed information about investment property [Line Items]
Investment properties	$ 9,663	$ 348	$ 9,621
Bottom of Range [Member]
Disclosure of detailed information about investment property [Line Items]
Overall capital interest rate	0.91%	0.91%	0.93%
Profit margin ratio	8.00%	8.00%	12.00%
Capitalization rate	0.53%	0.53%	0.73%
Top of Range [Member]
Disclosure of detailed information about investment property [Line Items]
Overall capital interest rate	3.05%	3.05%	3.03%
Profit margin ratio	20.00%	20.00%	20.00%
Capitalization rate	2.11%	2.11%	2.20%
At fair value [Member]
Disclosure of detailed information about investment property [Line Items]
Investment properties	$ 25,548		$ 22,644

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Capital interest rate.

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- Definition

Investment property capitalization rates.

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- Definition

Profit margin ratio.

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- Definition

The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2021-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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