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Net Income - Impairment Loss (Reversal of Impairment Loss) (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Disclosure of impairment loss and reversal of impairment loss [abstract]
Contract assets	$ 3		$ 2	$ 1
Trade notes and accounts receivable	179		128	109
Other receivables	6		22	7
Inventories	60	$ 2	23	34
Property, plant and equipment	0		299	0
Investment properties	(139)	(4)	336	(107)
Intangible assets	$ 0	$ 0	$ 0	$ 9

X

- Definition

Impairment loss (reversal of impairment loss) recognised in profit or loss other receivables.

+ References

No definition available.

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- Definition

Impairment loss (reversal) on receivables or contract assets arising from contracts with customers.

+ References

No definition available.

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- Definition

Impairment (reversal of) loss on investment properties.

+ References

No definition available.

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- References

No definition available.

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X

- Definition

The amount of impairment loss recognised in profit or loss for intangible assets and goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
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- Definition

The amount of impairment loss or reversal of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss; Trade receivables]

+ References

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

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2024-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount recognised resulting from the write-down of property, plant and equipment to its recoverable amount or reversals of those write-downs. [Refer: Property, plant and equipment]

+ References

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