Other Gains and Losses - Summary of Other Gains and Losses, Net (Detail) $ in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2023
TWD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2022
TWD ($)
|
Dec. 31, 2021
TWD ($)
|
|
| Gain (loss) on disposal of financial assets, net | ||||
| Investments in debt instruments at FVTOCI | $ (473.9) | $ (15.5) | $ (410.1) | $ 93.2 |
| Gain on disposal of investments accounted for using equity method, net | 15.7 | |||
| Gain (loss) on financial instruments at FVTPL, net | ||||
| Mandatorily measured at FVTPL | 6,523.1 | (622.5) | (7,973.6) | |
| The reversal (accrual) of expected credit loss of financial assets | ||||
| Investments in debt instruments at FVTOCI | (9.5) | (0.9) | (1.3) | |
| Financial assets at amortized cost | (26.2) | (51.5) | 4.0 | |
| Other gains,net | 932.4 | 72.8 | 489.7 | |
| Other gains and losses | $ 6,961.6 | $ 227.3 | $ (1,012.2) | $ (7,388.0) |