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Other Gains and Losses, Net (Tables) | 12 Months Ended
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Dec. 31, 2023
Text Block [Abstract] |
Summary of Other Gains and Losses |
|  | Years Ended December 31 |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | NT$ (In Millions) |  |  | NT$ (In Millions) |  |  | NT$ (In Millions) |
Gain (loss) on disposal of financial assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments at FVTOCI |  |  |  |  |  | $ | 93.2 |  |  |  |  |  |  |  |  |  |  | $ | (410.1 | ) |  |  |  |  |  |  |  |  |  | $ | (473.9 | ) |  |  |  |
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 |  |  |  |  |  |  | (7,973.6 | ) |  |  |  |  |  |  |  |  |  |  | (622.5 | ) |  |  |  |  |  |  |  |  |  |  | 6,523.1 |  |  |  |  |
The reversal (accrual) of expected credit loss of financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments at FVTOCI |  |  |  |  |  |  | (1.3 | ) |  |  |  |  |  |  |  |  |  |  | (0.9 | ) |  |  |  |  |  |  |  |  |  |  | (9.5 | ) |  |  |  |
Financial assets at amortized cost |  |  |  |  |  |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  | (51.5 | ) |  |  |  |  |  |  |  |  |  |  | (26.2 | ) |  |  |  |
Other gains, net |  |  |  |  |  |  | 489.7 |  |  |  |  |  |  |  |  |  |  |  | 72.8 |  |  |  |  |  |  |  |  |  |  |  | 932.4 |  |  |  |  |
|  |  |  |  |  | $ | (7,388.0 | ) |  |  |  |  |  |  |  |  |  | $ | (1,012.2 | ) |  |  |  |  |  |  |  |  |  | $ | 6,961.6 |  |  |  |  |

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