v3.26.1
Contents of Significant Accounts - Movement of Deferred Tax (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Changes in deferred tax assets and liabilities [Line Items]      
Beginning Balance $ (2,893,748) $ (501,553)  
Amounts recognized in profit or loss during the period (1,509,790) (2,389,544)  
Amounts recognized in other comprehensive income (loss) 545,131 145,216 $ (23,967)
Amounts recognized in equity (25,259) 1,174 (1,117)
Exchange adjustments 243,545 (149,041)  
Ending Balance $ (3,640,121) $ (2,893,748) $ (501,553)