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Other Current Monetary Assets | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Other Current Monetary Assets [Abstract] |
Other Current Monetary Assets |
14. | OTHER CURRENT MONETARY ASSETS
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Time deposits and negotiable certificates of deposit with maturities of more than three months |  | $ | 3,568 |  |  | $ | 4,054 |
Others |  |  | 1,253 |  |  |  | 1,254 |
|  | $ | 4,821 |  |  | $ | 5,308 |
The annual yield rates of time deposits and negotiable certificates of deposit with maturities of more than three months at the balance sheet dates were as follows:
|  | December 31
|  | 2016 |  | 2017
Time deposits and negotiable certificates of deposit with maturities of more than three months |  | 0.11%-1.95% |  | 0.06%-4.15%

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