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Interest Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Text Block [Abstract] |
Summary of interest income |
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Interest income |  |  |  |  |  |  |  |  |  |  |  |
Bank deposits |  | $ | 11,454.0 |  |  | $ | 5,139.1 |  |  | $ | 2,834.8 |
Financial assets at FVTPL |  |  | 339.5 |  |  |  | 2.5 |  |  |  | — |
Financial assets at FVTOCI |  |  | 3,476.2 |  |  |  | 3,121.9 |  |  |  | 2,192.5 |
Financial assets at amortized cost |  |  | 919.7 |  |  |  | 754.9 |  |  |  | 681.5 |
|  | $ | 16,189.4 |  |  | $ | 9,018.4 |  |  | $ | 5,708.8 |

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