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Changes in available-for-sale financial assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Changes in available-for-sale financial assets [Line Items] |  |  |  |
Beginning balance |  | ₩ 1,014,732 |  |
Acquisition |  | 233,285 |  |
Disposal | [1] | (461,423) |  |
Valuation |  | 5,248 |  |
Impairment |  | (2,713) |  | ₩ (86,703)
Others |  | (89,296) |  |
Ending balance |  | 699,833 |  | 1,014,732
Listed equity securities |  |  |  |
Changes in available-for-sale financial assets [Line Items] |  |  |  |
Beginning balance |  | 268,171 |  |
Acquisition |  | 106 |  |
Disposal | [1] | 0 |  |
Valuation |  | 8,156 |  |
Impairment |  | (97) |  |
Others |  | (1,883) |  |
Ending balance |  | 274,453 |  | 268,171
Unlisted equity securities |  |  |  |
Changes in available-for-sale financial assets [Line Items] |  |  |  |
Beginning balance |  | 746,561 |  |
Acquisition |  | 233,179 |  |
Disposal | [1] | (461,423) |  |
Valuation |  | (2,908) |  |
Impairment |  | (2,616) |  |
Others |  | (87,413) |  |
Ending balance |  | 425,380 | [2] | 746,561
Current Financial assets at fair value through profit or loss, category |  |  |  |
Changes in available-for-sale financial assets [Line Items] |  |  |  |
Beginning balance |  | 0 |  |
Acquisition |  | 0 |  |
Disposal | [1] | 0 |  |
Valuation |  | 0 |  |
Impairment |  | 0 |  |
Others |  | 0 |  |
Ending balance |  | 0 |  | 0
Non-Current Financial assets at fair value through profit or loss, category |  |  |  |
Changes in available-for-sale financial assets [Line Items] |  |  |  |
Beginning balance |  | 1,014,732 |  |
Acquisition |  | 233,285 |  |
Disposal | [1] | (461,423) |  |
Valuation |  | 5,248 |  |
Impairment |  | (2,713) |  |
Others |  | (89,296) |  |
Ending balance |  | ₩ 699,833 |  | ₩ 1,014,732
[1] | The Company recognized gain and loss on disposal of available-for-sale financial assets amounted to KRW1,130 million and KRW2,343 million, respectively, from the partial sales of Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 and others for the year ended December 31, 2017.
[2] | Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any.

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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 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -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 -URIDate 2018-03-16 + Details
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