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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | --- | --- | --- | ---
Cash |  |  |  |  |  |
Cash on hand | $ 487 |  | $ 353 |  |  |
Bank deposits | 10,961 |  | 9,433 |  |  |
Cash | 11,448 |  | 9,786 |  |  |
Cash equivalents (investments with maturities of less than three months) |  |  |  |  |  |
Commercial paper | 14,061 |  | 20,110 |  |  |
Negotiable certificates of deposit | 2,600 |  | 1,700 |  |  |
Time deposits | 2,308 |  | 2,451 |  |  |
Repurchase agreements collateralized by bonds | 0 |  | 3 |  |  |
Government stimulus vouchers | 3 |  | 0 |  |  |
Cash equivalents | 18,972 |  | 24,264 |  |  |
Cash and cash equivalents | $ 30,420 | $ 1,083 | $ 34,050 | $ 1,212 | $ 27,645 | $ 28,825

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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 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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