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Other Current Monetary Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Other Current Monetary Assets [Abstract] |
Summary of Other Current Monetary Assets |
|  | December 31 |
|  | 2017 |  |  | 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Time deposits and negotiable certificates of deposit with maturities of more than three months |  | $ | 4,054 |  |  | $ | 8,157 |
Others |  |  | 1,254 |  |  |  | 1,347 |
|  | $ | 5,308 |  |  | $ | 9,504 |
Annual Yield Rates of Time Deposits and Negotiable Certificates of Deposits with Maturities of more Than Three Months | 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
|  | 2017 |  | 2018
Time deposits and negotiable certificates of deposit with maturities of more than three months |  | 0.06%-4.15% |  | 0.03%-3.05%

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