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Investment Properties - Key Assumptions and Fair Values of Investment Properties (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)
Disclosure of detailed information about investment property [Line Items]
Investment properties	$ 12,302	$ 375	$ 9,805
Bottom of Range [Member]
Disclosure of detailed information about investment property [Line Items]
Overall capital interest rate	1.47%	1.47%	1.43%
Profit margin ratio	12.00%	12.00%	10.00%
Discount rate	0.00%
Capitalization rate	1.12%	1.12%	0.23%
Top of Range [Member]
Disclosure of detailed information about investment property [Line Items]
Overall capital interest rate	5.81%	5.81%	5.51%
Profit margin ratio	20.00%	20.00%	20.00%
Discount rate	10.00%
Capitalization rate	2.13%	2.13%	2.28%
At fair value [Member]
Disclosure of detailed information about investment property [Line Items]
Investment properties	$ 41,285		$ 24,237

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Capital interest rate.

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- Definition

Investment property capitalization rates.

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Profit margin ratio.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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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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