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Net Income - Interest Expenses (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Interest costs [abstract]
Interest on bonds payable	$ 168		$ 168	$ 161
Interest on lease liabilities	128		105	75
Interest paid to financial institutions	42		44	26
Others	1		2	1
Interest expenses	$ 339	$ 10	$ 319	$ 263

X

- Definition

Interest paid to financial institutions.

+ References

No definition available.

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- References

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- Definition

The amount of expense arising from interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of interest expense on bonds issued. [Refer: Interest expense; Bonds issued]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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- Definition

The amount of interest expense on other financial liabilities. [Refer: Interest expense; Other financial liabilities]

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