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Derivative Instrument (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |
Current derivative financial assets | ₩ 42,107 |  | ₩ 12,935 |  | ₩ 193,283
Non-current derivative financial assets | 60,228 |  | 19,691 |  | 588,091
Current derivative financial liabilities | 20,431 |  | 71,267 |  | 3,251
Non-current derivative financial liabilities | 291,732 |  | 356,792 |  | 135,435
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss) |  |  |  |  |
Net income effects of valuation gain (loss) | 153,203 |  | (874,667) |  | 288,068
Net income effects of transaction gain (loss) | 147,297 |  | (168,961) |  | (56,438)
Accumulated other comprehensive income (loss) | (6,429) | [1] | 31,884 |  | 46,750
Currency forward |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current derivative financial assets | 2,128 |  | 45 |  | 8,370
Non-current derivative financial assets | 12,606 |  | 0 |  | 32,806
Current derivative financial liabilities | 1,956 |  | 7,862 |  | 1,153
Non-current derivative financial liabilities | 0 |  | 1,278 |  | 34
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss) |  |  |  |  |
Net income effects of valuation gain (loss) | 12,632 |  | (41,889) |  | 15,993
Net income effects of transaction gain (loss) | 23,991 |  | (28,223) |  | 4,266
Accumulated other comprehensive income (loss) | 0 | [1] | 0 |  | 0
Currency swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current derivative financial assets | 39,979 |  | 12 |  | 184,913
Non-current derivative financial assets | 43,436 |  | 15,711 |  | 540,057
Current derivative financial liabilities | 14,881 |  | 61,997 |  | 0
Non-current derivative financial liabilities | 233,690 |  | 296,098 |  | 56,612
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss) |  |  |  |  |
Net income effects of valuation gain (loss) | 145,088 |  | (843,747) |  | 253,035
Net income effects of transaction gain (loss) | 123,670 |  | (137,376) |  | (68,266)
Accumulated other comprehensive income (loss) | (12,516) | [1] | 26,810 |  | 40,031
Interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current derivative financial assets | 0 |  | 0 |  | 0
Non-current derivative financial assets | 2,342 |  | 2,697 |  | 4,705
Current derivative financial liabilities | 1,439 |  | 1,408 |  | 2,098
Non-current derivative financial liabilities | 58,042 |  | 59,416 |  | 78,789
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss) |  |  |  |  |
Net income effects of valuation gain (loss) | (2,949) |  | 6,909 |  | 8,517
Net income effects of transaction gain (loss) | (364) |  | (3,362) |  | 7,562
Accumulated other comprehensive income (loss) | 6,087 | [1] | 5,074 |  | 6,719
Others |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current derivative financial assets | 0 | [2] | 12,878 | [2] | 0
Non-current derivative financial assets | 1,844 | [2] | 1,283 | [2] | 10,523
Current derivative financial liabilities | 2,155 | [3] | 0 | [3] | 0
Non-current derivative financial liabilities | 0 | [3] | 0 | [3] | 0
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss) |  |  |  |  |
Net income effects of valuation gain (loss) | (1,568) |  | 4,060 |  | 10,523
Net income effects of transaction gain (loss) | 0 |  | 0 |  | 0
Accumulated other comprehensive income (loss) | ₩ 0 | [1] | ₩ 0 |  | ₩ 0
[1] | For the year ended December 31, 2018, the net gain on valuation of derivatives applying cash flow hedge accounting of KRW211 million, net of tax, is included in other comprehensive income or loss.
[2] | The Company has a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in 'Others'.
[3] | The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd. and the fair value of the obligation is recorded in 'Others'.

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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