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Other Financial Assets and Liabilities - Summary of Available-For-Sale Financial Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [Line Items]
Financial assets available-for-sale	₩ 380,953	₩ 404,774	₩ 360,037
Less: non-current	(379,488)	(384,798)
Current	1,465	19,976
Marketable equity securities [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets available-for-sale	6,859	5,387
Non-marketable equity securities [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets available-for-sale	364,195	372,703
Debt securities [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets available-for-sale	₩ 9,899	₩ 26,684

X

- Definition

The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph d
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-URIDate 2017-03-09

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- Definition

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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 2017-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B
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- Definition

The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets]

+ References

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-Note Expiry date 2018-01-01
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-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph d
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-URIDate 2017-03-09

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