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Derivative Instrument (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]      
Current derivative financial assets ₩ 12,935 ₩ 193,283  
Non-current derivative financial assets 19,691 588,091  
Current derivative financial liabilities 71,267 3,251  
Non-current derivative financial liabilities 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) [Abstract]      
Net income effects of valuation gain (loss) (874,667) 288,068 ₩ 593,531
Net income effects of transaction gain (loss) (168,961) (56,438) 114,589
Accumulated other comprehensive income (loss) 31,884 [1] 46,750 [1] (2,844)
Currency forward [Member]      
Derivative [Line Items]      
Current derivative financial assets 45 8,370  
Non-current derivative financial assets   32,806  
Current derivative financial liabilities 7,862 1,153  
Non-current derivative financial liabilities 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) [Abstract]      
Net income effects of valuation gain (loss) (41,889) 15,993 357
Net income effects of transaction gain (loss) (28,223) 4,266 8,523
Accumulated other comprehensive income (loss) 0 0 0
Currency swap [Member]      
Derivative [Line Items]      
Current derivative financial assets 12 184,913  
Non-current derivative financial assets 15,711 540,057  
Current derivative financial liabilities 61,997 0  
Non-current derivative financial liabilities 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) [Abstract]      
Net income effects of valuation gain (loss) (843,747) 253,035 431,565
Net income effects of transaction gain (loss) (137,376) (68,266) 75,752
Accumulated other comprehensive income (loss) 26,810 [1] 40,031 [1] (6,926)
Interest rate swap [Member]      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 2,697 4,705  
Current derivative financial liabilities 1,408 2,098  
Non-current derivative financial liabilities 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) [Abstract]      
Net income effects of valuation gain (loss) 6,909 8,517 161,609
Net income effects of transaction gain (loss) (3,362) 7,562 30,314
Accumulated other comprehensive income (loss) 5,074 [1] 6,719 [1] 4,082
Others [Member]      
Derivative [Line Items]      
Current derivative financial assets 12,878 [2] 0  
Non-current derivative financial assets [2] 1,283 10,523  
Current derivative financial liabilities 0 0  
Non-current derivative financial liabilities 0 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) [Abstract]      
Net income effects of valuation gain (loss) 4,060 10,523 0
Net income effects of transaction gain (loss) 0 0 0
Accumulated other comprehensive income (loss) ₩ 0 ₩ 0 ₩ 0
[1] For the year ended December 31, 2017, the net gain on valuation of derivatives applying cash flow hedge accounting of ￦20,868 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, a related party of the Company, and the fair value of the option is recorded in ‘Others’.