Contents of Significant Accounts - Details of Distribution (Detail) - TWD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of equity [Line Items] | |||
| Appropriation of earnings, Cash dividends | $ 35,787,598 | $ 37,587,102 | $ 45,017,096 |
| Cash dividends | $ 2.6 | $ 2.85 | |
| Legal Reserve [Member] | |||
| Disclosure of equity [Line Items] | |||
| Appropriation of earnings | $ 4,182,207 | $ 4,738,237 | |
| Cash dividends [member] | |||
| Disclosure of equity [Line Items] | |||
| Appropriation of earnings, Cash dividends | $ 32,704,164 | $ 35,787,598 | |