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Contents of Significant Accounts - Inventories, Net - Additional Information (Detail) - TWD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Classes Of Inventories [Abstract]
Inventories recognized in operating costs	$ 148,575,000,000	$ 136,902,000,000	$ 145,979,000,000
Write-down of inventories	858,000,000	1,148,000,000	$ 98,000,000
Inventories pledged	$ 0	$ 0

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The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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The amount of inventories pledged as security for liabilities. [Refer: Inventories]

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

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