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Derivative Instrument (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Current derivative financial assets ₩ 29,525 ₩ 27,618  
Non-current derivative financial assets 136,888 283,415  
Current derivative financial liabilities 49,884 73,064  
Non-current derivative financial liabilities 315,235 96,896  
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) (455,715) 317,350 ₩ 153,203
Net income effects of transaction gain (loss) 65,393 86,415 147,297
Accumulated other comprehensive income (loss) 111,220 [1] 35,727 (6,429)
Currency forward | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 18,332 21  
Non-current derivative financial assets 0 43,931  
Current derivative financial liabilities 10,014 7,081  
Non-current derivative financial liabilities 4,977 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) (40,590) 24,265 12,632
Net income effects of transaction gain (loss) (17,911) 12,488 23,991
Accumulated other comprehensive income (loss) 0 [1] 0 0
Currency swap      
Derivative [Line Items]      
Current derivative financial assets 11,193 27,597  
Non-current derivative financial assets 127,386 229,258  
Current derivative financial liabilities 36,088 59,327  
Non-current derivative financial liabilities 232,669 45,184  
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) (406,607) 310,732 145,088
Net income effects of transaction gain (loss) 93,557 110,813 123,670
Accumulated other comprehensive income (loss) 105,642 [1] 38,802 (12,516)
Currency swap | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 82,931 111,026  
Current derivative financial liabilities 0 0  
Non-current derivative financial liabilities 93,245 13,250  
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) (108,090) 172,087 21,702
Net income effects of transaction gain (loss) 16,661 52,842 51,533
Accumulated other comprehensive income (loss) 0 [1] 0 0
Currency swap | Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 11,193 27,597  
Non-current derivative financial assets 44,455 118,232  
Current derivative financial liabilities 36,088 59,327  
Non-current derivative financial liabilities 139,424 31,934  
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) (298,517) 138,645 123,386
Net income effects of transaction gain (loss) 76,896 57,971 72,137
Accumulated other comprehensive income (loss) 105,642 [1] 38,802 (12,516)
Interest rate swap      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 9,502 7,592  
Current derivative financial liabilities 3,782 451  
Non-current derivative financial liabilities 66,451 50,756  
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) (1,845) (16,231) (2,949)
Net income effects of transaction gain (loss) (10,253) (36,886) (364)
Accumulated other comprehensive income (loss) 5,578 [1] (3,075) 6,087
Interest rate swap | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 9,502 7,592  
Current derivative financial liabilities 2,192 0  
Non-current derivative financial liabilities 22,687 26,610  
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) (309) (15,647) (2,949)
Net income effects of transaction gain (loss) (11,975) (2,495) (364)
Accumulated other comprehensive income (loss) 0 [1] 0 0
Interest rate swap | Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 0 0  
Current derivative financial liabilities 1,590 451  
Non-current derivative financial liabilities 43,764 24,146  
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) (1,536) (584) 0
Net income effects of transaction gain (loss) 1,722 (34,391) 0
Accumulated other comprehensive income (loss) 5,578 [1] (3,075) 6,087
Others | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 0 2,634  
Current derivative financial liabilities [2],[3],[4] 0 6,205  
Non-current derivative financial liabilities [2],[3],[4] 11,138 956  
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) (6,673) (1,416) (1,568)
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, 2020, the net gain on valuation of derivatives designated as cash flow hedge of KRW64,561 million, net of tax, is included in other comprehensive income (loss).
[2] The Company has an obligation to purchase the shares of Hyundai Green Power Co., Ltd., an associate of the Company from financial investors, and the fair value of the obligation 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'.
[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.