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Other Income (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Other Income |
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Interest income |  |  |  |  |  |  |  |  |  |  |  |
Bank deposits |  | $ | 3,928.0 |  |  | $ | 4,892.6 |  |  | $ | 6,412.8 |
Available-for-sale financial assets |  |  | 35.8 |  |  |  | 816.2 |  |  |  | 2,091.4 |
Held-to-maturity financial assets |  |  | 76.8 |  |  |  | 383.3 |  |  |  | 568.6 |
Structured product |  |  | 88.7 |  |  |  | 225.4 |  |  |  | 391.9 |
|  |  | 4,129.3 |  |  |  | 6,317.5 |  |  |  | 9,464.7 |
Dividend income |  |  | 621.5 |  |  |  | 137.4 |  |  |  | 145.6 |
|  | $ | 4,750.8 |  |  | $ | 6,454.9 |  |  | $ | 9,610.3 |

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