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Derivative Instrument - Summary of Derivative Financial Instruments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | ₩ 307,732 | ₩ 289,603 |
Non-current derivative financial assets |  | 692,662 | 728,421 |
Current derivative financial liabilities |  | 18,379 | 44,994 |
Non-current derivative financial liabilities |  | 433,855 | 387,757 |
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) |  | 234,199 | 224,218 | ₩ 822,994
Net income effects of transaction gain (loss) |  | 89,659 | 224,685 | 84,082
Other comprehensive income (loss) | [1] | (8,518) | (65,052) | (40,460)
Currency forward | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 18,019 | 648 |
Non-current derivative financial assets |  | 0 | 17,432 |
Current derivative financial liabilities |  | 4,755 | 32,660 |
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) |  | 510 | (20,570) | 33,066
Net income effects of transaction gain (loss) |  | 34,216 | (2,710) | 33,032
Other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 274,782 | 236,470 |
Non-current derivative financial assets |  | 527,701 | 589,300 |
Current derivative financial liabilities |  | 6,867 | 6,319 |
Non-current derivative financial liabilities |  | 287,824 | 328,995 |
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) |  | 269,795 | 155,937 | 787,264
Net income effects of transaction gain (loss) |  | 38,282 | 234,195 | 61,353
Other comprehensive income (loss) | [1] | (11,411) | (102,969) | (59,108)
Currency swap | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 196,013 | 102,080 |
Non-current derivative financial assets |  | 347,689 | 410,540 |
Current derivative financial liabilities |  | 6,867 | 6,319 |
Non-current derivative financial liabilities |  | 264,260 | 302,415 |
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) |  | 181,342 | (77,618) | 420,551
Net income effects of transaction gain (loss) |  | (1,244) | 104,572 | 16,265
Other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 78,769 | 134,390 |
Non-current derivative financial assets |  | 180,012 | 178,760 |
Current derivative financial liabilities |  | 0 | 0 |
Non-current derivative financial liabilities |  | 23,564 | 26,580 |
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) |  | 88,453 | 233,555 | 366,713
Net income effects of transaction gain (loss) |  | 39,526 | 129,623 | 45,088
Other comprehensive income (loss) | [1] | (11,411) | (102,969) | (59,108)
Interest rate swap |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 12,124 | 52,485 |
Non-current derivative financial assets |  | 129,570 | 81,188 |
Current derivative financial liabilities |  | 0 | 0 |
Non-current derivative financial liabilities |  | 48,238 | 2,735 |
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) |  | (16,377) | 66,341 | 18,123
Net income effects of transaction gain (loss) |  | 10,400 | (6,800) | (10,303)
Other comprehensive income (loss) | [1] | 2,893 | 37,917 | 18,648
Interest rate swap | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets |  | 12,124 | 52,485 |
Non-current derivative financial assets |  | 129,570 | 81,188 |
Current derivative financial liabilities |  | 0 | 0 |
Non-current derivative financial liabilities |  | 48,238 | 2,735 |
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) |  | (16,377) | 66,341 | 18,123
Net income effects of transaction gain (loss) |  | 10,400 | (6,800) | (10,303)
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 | 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) |  |  |  |
Net income effects of valuation gain (loss) |  | 0 | 0 | 0
Net income effects of transaction gain (loss) |  | 0 | 0 | 0
Other comprehensive income (loss) | [1] | 2,893 | 37,917 | 18,648
Others | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Current derivative financial assets | [2],[3] | 2,807 | 0 |
Non-current derivative financial assets | [2],[3] | 35,391 | 40,501 |
Current derivative financial liabilities | [2],[4] | 6,757 | 6,015 |
Non-current derivative financial liabilities | [2],[4] | 97,793 | 56,027 |
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) |  | (19,729) | 22,510 | (15,459)
Net income effects of transaction gain (loss) |  | 6,761 | 0 | 0
Other comprehensive income (loss) | [1] | ₩ 0 | ₩ 0 | ₩ 0
[1] | For the years ended December 31, 2021, 2022 and 2023, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 million, ￦24,415 million and ￦3,654 million, net of tax, are included in other comprehensive loss, respectively.
[2] | The Company recorded the fair value of derivatives in accordance with the shareholders’ agreement of its associate, Hyundai Green Power Co., Ltd., as other derivatives. In addition, the fair value of the derivatives regarding the power sales agreement of its subsidiary, Elara Energy Project, LLC, were recorded as other derivatives.
[3] | The Company recorded the fair value of derivatives regarding the Power Purchase Agreement (“PPA”) of its subsidiary Columboola Solar Farm Hold Co Pty., Ltd. as other derivatives.
[4] | In relation to the agreement to purchase hybrid securities issued by Samcheok Eco Materials Co., Ltd., an associate of the Company, the Company has recognized as other derivative liabilities the fair value of ￦18,752 million for its performance obligation to the underwriter of the bonds. In addition, the Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recorded the related fair value of ￦5,986 million (prior year : ￦6,197 million) as other derivative liabilities.

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