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Net Income - Other Income (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Analysis of income and expense [abstract]
Dividend income	$ 240	$ 7	$ 167	$ 157
Rental income	75		76	79
Others	148		139	133
Other income	$ 463	$ 14	$ 382	$ 369

X

- Definition

Miscellaneous other non operating income.

+ References

No definition available.

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- Definition

The amount of non-operating income 1.

+ References

No definition available.

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- References

No definition available.

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- Definition

The amount of income recognised from rental activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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- Definition

The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital.

+ References

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