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Derivative Instrument - Summary of Derivative (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | ₩ 289,603 | ₩ 126,938 |
Non-current derivative financial assets |  | 728,421 | 520,845 |
Current derivative financial liabilities |  | 44,994 | 7,291 |
Non-current derivative financial liabilities |  | 387,757 | 70,740 |
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) |  | 224,218 | 822,994 | ₩ (455,715)
Net income effects of transaction gain (loss) |  | 224,685 | 84,082 | 65,393
Accumulated other comprehensive income (loss) | [1] | (65,052) | (40,460) | 111,220
Currency forward | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 648 | 559 |
Non-current derivative financial assets |  | 17,432 | 6,899 |
Current derivative financial liabilities |  | 32,660 | 301 |
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) |  |  |  |
Net income effects of valuation gain (loss) |  | (20,570) | 33,066 | (40,590)
Net income effects of transaction gain (loss) |  | (2,710) | 33,032 | (17,911)
Accumulated other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 236,470 | 125,877 |
Non-current derivative financial assets |  | 589,300 | 506,957 |
Current derivative financial liabilities |  | 6,319 | 4,446 |
Non-current derivative financial liabilities |  | 328,995 | 16,708 |
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) |  | 155,937 | 787,264 | (406,607)
Net income effects of transaction gain (loss) |  | 234,195 | 61,353 | 93,557
Accumulated other comprehensive income (loss) | [1] | (102,969) | (59,108) | 105,642
Currency swap | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 102,080 | 92,313 |
Non-current derivative financial assets |  | 410,540 | 335,765 |
Current derivative financial liabilities |  | 6,319 | 4,446 |
Non-current derivative financial liabilities |  | 302,415 | 15,576 |
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) |  | (77,618) | 420,551 | (108,090)
Net income effects of transaction gain (loss) |  | 104,572 | 16,265 | 16,661
Accumulated other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 134,390 | 33,564 |
Non-current derivative financial assets |  | 178,760 | 171,192 |
Current derivative financial liabilities |  | 0 | 0 |
Non-current derivative financial liabilities |  | 26,580 | 1,132 |
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) |  | 233,555 | 366,713 | (298,517)
Net income effects of transaction gain (loss) |  | 129,623 | 45,088 | 76,896
Accumulated other comprehensive income (loss) | [1] | (102,969) | (59,108) | 105,642
Interest rate swap |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 52,485 | 502 |
Non-current derivative financial assets |  | 81,188 | 6,980 |
Current derivative financial liabilities |  | 0 | 2,544 |
Non-current derivative financial liabilities |  | 2,735 | 28,138 |
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) |  | 66,341 | 18,123 | (1,845)
Net income effects of transaction gain (loss) |  | (6,800) | (10,303) | (10,253)
Accumulated other comprehensive income (loss) | [1] | 37,917 | 18,648 | 5,578
Interest rate swap | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 52,485 | 502 |
Non-current derivative financial assets |  | 81,188 | 6,980 |
Current derivative financial liabilities |  | 0 | 174 |
Non-current derivative financial liabilities |  | 2,735 | 2,829 |
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) |  | 66,341 | 18,123 | (309)
Net income effects of transaction gain (loss) |  | (6,800) | (10,303) | (11,975)
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 |  | 0 | 2,370 |
Non-current derivative financial liabilities |  | 0 | 25,309 |
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 | 0 | (1,536)
Net income effects of transaction gain (loss) |  | 0 | 0 | 1,722
Accumulated other comprehensive income (loss) | [1] | 37,917 | 18,648 | 5,578
Others | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets | [2] | 0 | 0 |
Non-current derivative financial assets | [2] | 40,501 | 9 |
Current derivative financial liabilities | [2],[3],[4] | 6,015 | 0 |
Non-current derivative financial liabilities | [2],[3],[4] | 56,027 | 25,894 |
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) |  | 22,510 | (15,459) | (6,673)
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, 2022, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦24,415 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’(See note 47).
[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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