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Related Parties Transactions - Compensation of Directors and Other Key Management Personnel (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of transactions between related parties [abstract]
Short-term employee benefits	$ 369	$ 352	$ 360
Post-employment benefits	9	26	8
Share-based payment	1	1	2
Termination benefits	0	0	0
Compensation of key management personnel	$ 379	$ 379	$ 370

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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-Number 24
-IssueDate 2024-01-01
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The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]]

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