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Cash and Cash Equivalents | 12 Months Ended
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Dec. 31, 2017
Cash And Cash Equivalents [Abstract] |
Cash and Cash Equivalents |
7. | CASH AND CASH EQUIVALENTS
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cash |  |  |  |  |  |  |  |
Cash on hand |  | $ | 370 |  |  | $ | 383 |
Bank deposits |  |  | 7,240 |  |  |  | 7,877 |
|  |  | 7,610 |  |  |  | 8,260 |
Cash equivalents (investments with maturities of less than three months) |  |  |  |  |  |  |  |
Commercial paper |  | $ | 11,436 |  |  | $ | 10,179 |
Negotiable certificate of deposit |  |  | 10,800 |  |  |  | 7,950 |
Time deposits |  |  | 1,254 |  |  |  | 2,436 |
|  |  | 23,490 |  |  |  | 20,565 |
|  | $ | 31,100 |  |  | $ | 28,825 |
The annual yield rates of bank deposits, commercial paper, negotiable certificate of deposit and time deposits as of balance sheet dates were as follows:
|  | December 31
|  | 2016 |  | 2017
Bank deposits |  | 0.00%-0.42% |  | 0.00%-0.70%
Commercial paper |  | 0.32%-0.42% |  | 0.32%-0.40%
Negotiable certificate of deposit |  | 0.35%-0.50% |  | 0.40%-0.50%
Time deposits |  | 0.40%-3.30% |  | 0.52%-4.40%

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- Definition The disclosure of cash and cash equivalents. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_10_e&doctype=Standard -URIDate 2016-03-31 + Details
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