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Lease Arrangements - Additional Information (Details) - TWD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Sublease	$ 0	$ 0	$ 0
Bottom of Range [Member] | Offices, Server rooms and Stores [Member]
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Lease Term	1 year
Top of Range [Member] | Offices, Server rooms and Stores [Member]
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Lease Term	30 years
Taiwan [Member] | Bottom of Range [Member] | Handsets Base Stations [Member]
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Lease Term	1 year
Taiwan [Member] | Top of Range [Member] | Handsets Base Stations [Member]
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Lease Term	20 years

X

- Definition

Lease term.

+ References

No definition available.

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph f
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_f&doctype=Standard
-URIDate 2024-03-27

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