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Derivative Instrument - Summary of Derivatives (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | ₩ 126,938 | ₩ 29,525 |
Non-current derivative financial assets |  | 520,845 | 136,888 |
Current derivative financial liabilities |  | 7,291 | 49,884 |
Non-current derivative financial liabilities |  | 70,740 | 315,235 |
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) |  | 822,994 | (455,715) | ₩ 317,350
Net income effects of transaction gain (loss) |  | 84,082 | 65,393 | 86,415
Accumulated other comprehensive income (loss) | [1] | (40,460) | 111,220 | 35,727
Currency forward | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 559 | 18,332 |
Non-current derivative financial assets |  | 6,899 | 0 |
Current derivative financial liabilities |  | 301 | 10,014 |
Non-current derivative financial liabilities |  | 0 | 4,977 |
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) |  | 33,066 | (40,590) | 24,265
Net income effects of transaction gain (loss) |  | 33,032 | (17,911) | 12,488
Accumulated other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 125,877 | 11,193 |
Non-current derivative financial assets |  | 506,957 | 127,386 |
Current derivative financial liabilities |  | 4,446 | 36,088 |
Non-current derivative financial liabilities |  | 16,708 | 232,669 |
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) |  | 787,264 | (406,607) | 310,732
Net income effects of transaction gain (loss) |  | 61,353 | 93,557 | 110,813
Accumulated other comprehensive income (loss) | [1] | (59,108) | 105,642 | 38,802
Currency swap | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 92,313 | 0 |
Non-current derivative financial assets |  | 335,765 | 82,931 |
Current derivative financial liabilities |  | 4,446 | 0 |
Non-current derivative financial liabilities |  | 15,576 | 93,245 |
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) |  | 420,551 | (108,090) | 172,087
Net income effects of transaction gain (loss) |  | 16,265 | 16,661 | 52,842
Accumulated other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 33,564 | 11,193 |
Non-current derivative financial assets |  | 171,192 | 44,455 |
Current derivative financial liabilities |  | 0 | 36,088 |
Non-current derivative financial liabilities |  | 1,132 | 139,424 |
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) |  | 366,713 | (298,517) | 138,645
Net income effects of transaction gain (loss) |  | 45,088 | 76,896 | 57,971
Accumulated other comprehensive income (loss) | [1] | (59,108) | 105,642 | 38,802
Interest rate swap |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 502 | 0 |
Non-current derivative financial assets |  | 6,980 | 9,502 |
Current derivative financial liabilities |  | 2,544 | 3,782 |
Non-current derivative financial liabilities |  | 28,138 | 66,451 |
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) |  | 18,123 | (1,845) | (16,231)
Net income effects of transaction gain (loss) |  | (10,303) | (10,253) | (36,886)
Accumulated other comprehensive income (loss) | [1] | 18,648 | 5,578 | (3,075)
Interest rate swap | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 502 | 0 |
Non-current derivative financial assets |  | 6,980 | 9,502 |
Current derivative financial liabilities |  | 174 | 2,192 |
Non-current derivative financial liabilities |  | 2,829 | 22,687 |
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) |  | 18,123 | (309) | (15,647)
Net income effects of transaction gain (loss) |  | (10,303) | (11,975) | (2,495)
Accumulated other comprehensive income (loss) | [1] | 0 | 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 |  | 2,370 | 1,590 |
Non-current derivative financial liabilities |  | 25,309 | 43,764 |
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) |  | 0 | (1,536) | (584)
Net income effects of transaction gain (loss) |  | 0 | 1,722 | (34,391)
Accumulated other comprehensive income (loss) | [1] | 18,648 | 5,578 | (3,075)
Others | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 0 | 0 |
Non-current derivative financial assets |  | 9 | 0 |
Current derivative financial liabilities | [2],[3],[4] | 0 | 0 |
Non-current derivative financial liabilities | [2],[3],[4] | 25,894 | 11,138 |
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) |  | (15,459) | (6,673) | (1,416)
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, 2021, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 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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