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Other Gains and Losses, Net | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Other Gains and Losses, Net |
27. | OTHER GAINS AND LOSSES, NET
|  | Years Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Gain (loss) on disposal of financial assets, net |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments at FVTOCI |  | $ | (989.1 | ) |  | $ | 537.8 |  |  | $ | 1,439.4 |
Loss on disposal of subsidiaries |  |  | — |  |  |  | (4.6 | ) |  |  | — |
Gain (loss) on financial instruments at FVTPL, net |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily measured at FVT P L |  |  | (2,293.9 | ) |  |  | (2,360.7 | ) |  |  | 8,244.5 |
Gain (loss) arising from fair value hedges, net |  |  | (2.3 | ) |  |  | 13.1 |  |  |  | — |
The reversal (accrual) of expected credit loss of financial assets |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments at FVTOCI |  |  | 2.0 |  |  |  | (6.9 | ) |  |  | 0.9 |
Financial assets at amortized cost |  |  | 0.4 |  |  |  | 5.2 |  |  |  | (4.6 | )
Other gains (losses), net |  |  | (127.9 | ) |  |  | 665.1 |  |  |  | 426.2 |
|  | $ | (3,410.8 | ) |  | $ | (1,151.0 | ) |  | $ | 10,106.4 |

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