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Short-term Loans - Summary of Short-term Loans (Detail) € in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Amount | $ 88,754.7 | $ 63,766.8 | $ 2,899.5 |  |
Original loan content |  |  | $ 2,610.0 | € 242.0 | $ 2,150.0
Maturity date | 2019-01 | 2018-02 |  |  |
Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual interest rate | 0.01% | 1.54% | 0.01% | 0.01% | 1.54%
Top of range [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual interest rate | 3.22% | 1.82% | 3.22% | 3.22% | 1.82%
Unsecured Loans [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Amount | $ 88,754.7 | $ 63,766.8 |  |  |

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- Definition The amount of contractual undiscounted cash flows for gross commitments to receive a loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph B11D -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B11D_e&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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