Contents of Significant Accounts - Amortization Amounts of Intangible Assets (Detail) - TWD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Operating costs [member]
Disclosure Of Intangible Assets [Line Items]
Amortization amounts of intangible assets	$ 1,246,679	$ 999,321
Operating expenses [member]
Disclosure Of Intangible Assets [Line Items]
Amortization amounts of intangible assets	$ 1,504,828	$ 1,637,217

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.

No definition available.

Name:	ifrs-full_DisclosureOfIntangibleAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration