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Other Gains and Losses, Net (Tables) | 12 Months Ended
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Dec. 31, 2021
Text Block [Abstract] |
Summary of Other Gains and Losses |
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Gain on disposal of financial assets, net |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments at FVTOCI |  | $ | 537.8 |  |  | $ | 1,439.4 |  |  | $ | 93.2 |
Loss on disposal of subsidiaries |  |  | (4.6 | ) |  |  | — |  |  |  | — |
Gain (loss) on financial instruments at FVTPL, net |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  | (2,360.7 | ) |  |  | 8,244.5 |  |  |  | (7,973.6 | )
Gain arising from fair value hedges, net |  |  | 13.1 |  |  |  | — |  |  |  | — |
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
The reversal (accrual) of expected credit loss of financial assets |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments at FVTOCI |  | $ | (6.9 | ) |  | $ | 0.9 |  |  | $ | (1.3 | )
Financial assets at amortized cost |  |  | 5.2 |  |  |  | (4.6 | ) |  |  | 4.0 |
Other gains, net |  |  | 665.1 |  |  |  | 426.2 |  |  |  | 489.7 |
|  | $ | (1,151.0 | ) |  | $ | 10,106.4 |  |  | $ | (7,388.0 | )

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