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Derivative Instrument (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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.