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Financial Assets and Liabilities at Fair Value through Profit or Loss - Outstanding Cross Currency Swap Contracts for which Hedge Accounting Treatment is not Applied (Detail) - 12 months ended Dec. 31, 2016 - Cross currency swap contracts [member] $ in Millions, $ in Millions | TWD ($) | USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2017-01 |
Contract Amount | $ 5,487.6 | $ 170
Range of Interest Rates Paid | 3.98% |
Range of Interest Rates Received | 0.00% |

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- Definition The amount of contractual undiscounted cash flows in relation to contractual amounts to be exchanged in a derivative financial instrument for which gross cash flows are exchanged. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph B11D -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B11D_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Derivative interest rate paid on swap. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Derivative interest rate received on swap. + References No definition available. + Details
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- Definition Derivative maturity date month and year. + References No definition available. + Details
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- Details
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