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Interest Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Summary of interest income |
|  | Years Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Interest income |  |  |  |  |  |  |  |  |  |  |  |
Bank deposit s |  | $ | 10,310.7 |  |  | $ | 11,454.0 |  |  | $ | 5,139.1 |
Financial assets at FVTPL |  |  | 382.7 |  |  |  | 339.5 |  |  |  | 2.5 |
Financial assets at FVTOCI |  |  | 3,078.6 |  |  |  | 3,476.2 |  |  |  | 3,121.9 |
Financial assets at amortized cost |  |  | 922.4 |  |  |  | 919.7 |  |  |  | 754.9 |
|  | $ | 14,694.4 |  |  | $ | 16,189.4 |  |  | $ | 9,018.4 |

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