Contents of Significant Accounts - Summary of Stock Held by Associates (Detail) - shares shares in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure Of Stock Held By Associates [Line Items] | ||
| Number of shares in entity held by its subsidiaries or associates | 900,941 | 900,961 |
| HSUN CHIEH [member] | ||
| Disclosure Of Stock Held By Associates [Line Items] | ||
| Number of shares in entity held by its subsidiaries or associates | 441,371 | 441,371 |
| SIS [member] | ||
| Disclosure Of Stock Held By Associates [Line Items] | ||
| Number of shares in entity held by its subsidiaries or associates | 266,580 | 266,580 |
| YANN YUAN [member] | ||
| Disclosure Of Stock Held By Associates [Line Items] | ||
| Number of shares in entity held by its subsidiaries or associates | 192,963 | 192,963 |
| UNIMICRON and its Subsidiaries [member] | ||
| Disclosure Of Stock Held By Associates [Line Items] | ||
| Number of shares in entity held by its subsidiaries or associates | 27 | 47 |