Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail) - TWD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Financial assets at fair value through other comprehensive income [abstract] | |||
| Proceeds from sale of shares | $ 272.0 | $ 561.6 | $ 628.7 |
| Unrealized gain (loss) on investments in equity instruments at fair value through other comprehensive income | 151.9 | 303.2 | $ 186.0 |
| Cumulative loss allowance for expected credit loss | $ 47.3 | $ 37.8 | |