Contents of Significant Accounts - Financial Assets at Fair Value through Other Comprehensive Income (Detail) $ in Thousands, $ in Thousands |
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
|---|---|---|---|
| Disclosure of financial assets [line items] | |||
| Financial assets at fair value through other comprehensive income, current | $ 4,630,441 | $ 147,607 | $ 5,893,377 |
| Financial assets at fair value through other comprehensive income, non-current | 9,144,308 | $ 291,499 | 11,315,951 |
| Total | 13,774,749 | 17,209,328 | |
| Common stocks [member] | |||
| Disclosure of financial assets [line items] | |||
| Total | 13,571,941 | 17,004,448 | |
| Preferred stocks [member] | |||
| Disclosure of financial assets [line items] | |||
| Total | $ 202,808 | $ 204,880 |