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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2014 TWD ($)
--- | --- | --- | --- | --- | --- | ---
Cash |  |  |  |  |  |
Cash on hand | $ 383 |  | $ 370 |  |  |
Bank deposits | 7,877 |  | 7,240 |  |  |
Cash | 8,260 |  | 7,610 |  |  |
Cash equivalents (investments with maturities of less than three months) |  |  |  |  |  |
Commercial paper | 10,179 |  | 11,436 |  |  |
Negotiable certificate of deposit | 7,950 |  | 10,800 |  |  |
Time deposits | 2,436 |  | 1,254 |  |  |
Cash equivalents | 20,565 |  | 23,490 |  |  |
Cash and cash equivalents | $ 28,825 | $ 973 | $ 31,100 | $ 1,049 | $ 30,271 | $ 23,560

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- Definition The amount of cash on hand and demand deposits. [Refer: Cash on hand] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_i&doctype=Standard -URIDate 2016-03-31 + Details
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