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Investment Properties - Key Assumptions and Fair Values of Investment Properties (Detail) $ in Millions, $ in Millions	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)
Disclosure of detailed information about investment property [Line Items]
Investment properties	$ 9,805	$ 320	$ 9,804
Bottom of Range [Member]
Disclosure of detailed information about investment property [Line Items]
Overall capital interest rate	1.43%	1.43%	1.31%
Profit margin ratio	10.00%	10.00%	8.00%
Capitalization rate	0.23%	0.23%	0.23%
Top of Range [Member]
Disclosure of detailed information about investment property [Line Items]
Overall capital interest rate	5.51%	5.51%	4.91%
Profit margin ratio	20.00%	20.00%	20.00%
Capitalization rate	2.28%	2.28%	2.16%
At fair value [Member]
Disclosure of detailed information about investment property [Line Items]
Investment properties	$ 24,237		$ 25,328

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Capital interest rate.

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Investment property capitalization rates.

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- Definition

Profit margin ratio.

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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.

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