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Derivative Instrument (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |  |
Current derivative financial assets |  | ₩ 27,618 |  | ₩ 42,107 |  | ₩ 12,935
Non-current derivative financial assets |  | 283,415 |  | 60,228 |  | 19,691
Current derivative financial liabilities |  | 73,064 |  | 20,431 |  | 71,267
Non-current derivative financial liabilities |  | 96,896 |  | 291,732 |  | 356,792
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) |  | 317,350 |  | 153,203 |  | (874,667)
Net income effects of transaction gain (loss) |  | 86,415 |  | 147,297 |  | (168,961)
Accumulated other comprehensive income (loss) | [1] | 35,727 |  | (6,429) |  | 31,884
Currency forward |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Current derivative financial assets |  | 21 |  | 2,128 |  | 45
Non-current derivative financial assets |  | 43,931 |  | 12,606 |  | 0
Current derivative financial liabilities |  | 7,081 |  | 1,956 |  | 7,862
Non-current derivative financial liabilities |  | 0 |  | 0 |  | 1,278
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) |  | 24,265 |  | 12,632 |  | (41,889)
Net income effects of transaction gain (loss) |  | 12,488 |  | 23,991 |  | (28,223)
Accumulated other comprehensive income (loss) | [1] | 0 |  | 0 |  | 0
Currency swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Current derivative financial assets |  | 27,597 |  | 39,979 |  | 12
Non-current derivative financial assets |  | 229,258 |  | 43,436 |  | 15,711
Current derivative financial liabilities |  | 59,327 |  | 14,881 |  | 61,997
Non-current derivative financial liabilities |  | 45,184 |  | 233,690 |  | 296,098
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) |  | 310,732 |  | 145,088 |  | (843,747)
Net income effects of transaction gain (loss) |  | 110,813 |  | 123,670 |  | (137,376)
Accumulated other comprehensive income (loss) | [1] | 38,802 |  | (12,516) |  | 26,810
Interest rate swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Current derivative financial assets |  | 0 |  | 0 |  | 0
Non-current derivative financial assets |  | 7,592 |  | 2,342 |  | 2,697
Current derivative financial liabilities |  | 451 |  | 1,439 |  | 1,408
Non-current derivative financial liabilities |  | 50,756 |  | 58,042 |  | 59,416
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) |  | (16,231) |  | (2,949) |  | 6,909
Net income effects of transaction gain (loss) |  | (36,886) |  | (364) |  | (3,362)
Accumulated other comprehensive income (loss) | [1] | (3,075) |  | 6,087 |  | 5,074
Others |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Current derivative financial assets |  | 0 | [2] | 0 | [2] | 12,878
Non-current derivative financial assets |  | 2,634 | [2] | 1,844 | [2] | 1,283
Current derivative financial liabilities |  | 6,205 | [3],[4] | 2,155 | [3],[4] | 0
Non-current derivative financial liabilities |  | 956 | [3],[4] | 0 | [3],[4] | 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) |  | (1,416) |  | (1,568) |  | 4,060
Net income effects of transaction gain (loss) |  | 0 |  | 0 |  | 0
Accumulated other comprehensive income (loss) | [1] | ₩ 0 |  | ₩ 0 |  | ₩ 0
[1] | For the year ended December 31, 2019, the net gain on valuation of derivatives designated as cash flow hedge of W19,242 million, net of tax, is included in other comprehensive income or loss.
[2] | The Company had a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in 'Others' in the prior year. The Company sold their shares during the year ended December 31, 2019. As described in Note 16, the Company has a right to purchase the shares of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, and the amount is the fair value of the stock option.
[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'
[4] | The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recognized its fair value as other derivative liabilities.

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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=121641772&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=121641772&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=121641772&loc=d3e681-108580 + Details
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