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

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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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