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Fair Value Information - Financial Instruments Measured at Fair Value on a Recurring Basis (Detail) - TWD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets and liabilities [Line Items]
Equity investments	$ 5,751	$ 4,764
Measured at FVTPL Held for trading	1	1
Fair value on a recurring basis [Member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Equity investments	3,125	2,521
Measured at FVTPL Held for trading	1	1
Cash flow hedge-forward exchange contracts, financial liabilities	1	1
Fair value on a recurring basis [Member] | Level 1 [Member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Equity investments	3,125	2,521
Fair value on a recurring basis [Member] | Level 2 [Member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Measured at FVTPL Held for trading	1	1
Cash flow hedge-forward exchange contracts, financial liabilities	$ 1	$ 1

X

- Definition

Disclosure of fair value measurement of assets and liabilities.

+ References

No definition available.

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- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard
-URIDate 2016-03-31

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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

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- Definition

The amount of financial liabilities at fair value through profit or loss that meet the definition of held for trading. A financial liability is classified as held for trading if: (a) it is acquired or incurred principally for the purpose of selling or repurchasing it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: Financial liabilities at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 8
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_8_e&doctype=Standard
-URIDate 2016-03-31

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