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Available-for-sale Financial Assets Non Current - Summary of Available-for-sale Financial Assets Non Current(Detail) - TWD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial assets [Line Items] |  |
Available-for-sale financial assets, non current | $ 5,751 | $ 4,764
Domestic listed stocks [Member] |  |
Disclosure of financial assets [Line Items] |  |
Available-for-sale financial assets, non current | 3,125 | 2,521
Domestic non-listed stocks [Member] |  |
Disclosure of financial assets [Line Items] |  |
Available-for-sale financial assets, non current | 2,332 | 1,949
Foreign non-listed stocks [Member] |  |
Disclosure of financial assets [Line Items] |  |
Available-for-sale financial assets, non current | $ 294 | $ 294

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- Definition The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_8_d&doctype=Standard -URIDate 2016-03-31 + Details
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