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Interest Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Text Block [Abstract] |
Summary of interest income |
|  | Years Ended December 31 |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ | 2,834.8 |  |  |  |  |  |  |  |  |  |  | $ | 17,831.3 |  |  |  |  |  |  |  |  |  |  | $ | 49,740.0 |  |  |  |  |
Financial assets at amortized cost |  |  |  |  |  |  | 681.5 |  |  |  |  |  |  |  |  |  |  |  | 2,008.6 |  |  |  |  |  |  |  |  |  |  |  | 6,363.7 |  |  |  |  |
Financial assets at FVTOCI |  |  |  |  |  |  | 2,192.5 |  |  |  |  |  |  |  |  |  |  |  | 2,582.3 |  |  |  |  |  |  |  |  |  |  |  | 4,190.2 |  |  |  |  |
|  |  |  |  |  | $ | 5,708.8 |  |  |  |  |  |  |  |  |  |  | $ | 22,422.2 |  |  |  |  |  |  |  |  |  |  | $ | 60,293.9 |  |  |  |  |

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