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