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Derivatives - Summary of Derivative Financial Instruments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | ₩ 760,554 | ₩ 307,732 |
Non-current derivative financial assets |  | 1,930,610 | 692,662 |
Current derivative financial liabilities |  | 23,914 | 18,379 |
Non-current derivative financial liabilities |  | 260,911 | 433,855 |
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) |  | 2,103,711 | 234,199 | ₩ 224,218
Net income effects of transaction gain (loss) |  | 302,657 | 89,659 | 224,685
Other comprehensive income (loss) | [1] | 20,306 | (8,518) | (65,052)
Currency forward | Not Designated as Hedging Instrument |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | 12,153 | 18,019 |
Non-current derivative financial assets |  | 0 | 0 |
Current derivative financial liabilities |  | 132 | 4,755 |
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) |  | 12,021 | 510 | (20,570)
Net income effects of transaction gain (loss) |  | 78,237 | 34,216 | (2,710)
Other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | 733,374 | 274,782 |
Non-current derivative financial assets |  | 1,630,570 | 527,701 |
Current derivative financial liabilities |  | 1,640 | 6,867 |
Non-current derivative financial liabilities |  | 36,328 | 287,824 |
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) |  | 2,058,411 | 269,795 | 155,937
Net income effects of transaction gain (loss) |  | 190,000 | 38,282 | 234,195
Other comprehensive income (loss) | [1] | 18,622 | (11,411) | (102,969)
Currency swap | Not Designated as Hedging Instrument |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | 372,445 | 196,013 |
Non-current derivative financial assets |  | 1,159,600 | 347,689 |
Current derivative financial liabilities |  | 1,640 | 6,867 |
Non-current derivative financial liabilities |  | 31,433 | 264,260 |
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) |  | 1,403,564 | 181,342 | (77,618)
Net income effects of transaction gain (loss) |  | 163,231 | (1,244) | 104,572
Other comprehensive income (loss) | [1] | 0 | 0 | 0
Currency swap | Designated as Hedging Instrument |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | 360,929 | 78,769 |
Non-current derivative financial assets |  | 470,970 | 180,012 |
Current derivative financial liabilities |  | 0 | 0 |
Non-current derivative financial liabilities |  | 4,895 | 23,564 |
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) |  | 654,847 | 88,453 | 233,555
Net income effects of transaction gain (loss) |  | 26,769 | 39,526 | 129,623
Other comprehensive income (loss) | [1] | 18,622 | (11,411) | (102,969)
Interest rate swap |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | 9,571 | 12,124 |
Non-current derivative financial assets |  | 176,138 | 129,570 |
Current derivative financial liabilities |  | 127 | 0 |
Non-current derivative financial liabilities |  | 76,356 | 48,238 |
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) |  | 21,270 | (16,377) | 66,341
Net income effects of transaction gain (loss) |  | 18,834 | 10,400 | (6,800)
Other comprehensive income (loss) | [1] | 1,684 | 2,893 | 37,917
Interest rate swap | Not Designated as Hedging Instrument |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets |  | 9,571 | 12,124 |
Non-current derivative financial assets |  | 176,138 | 129,570 |
Current derivative financial liabilities |  | 127 | 0 |
Non-current derivative financial liabilities |  | 76,356 | 48,238 |
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) |  | 21,270 | (16,377) | 66,341
Net income effects of transaction gain (loss) |  | 18,834 | 10,400 | (6,800)
Other comprehensive income (loss) | [1] | 0 | 0 | 0
Interest rate swap | Designated as Hedging Instrument |  |  |  |
Derivatives [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] | 1,684 | 2,893 | 37,917
Others | Not Designated as Hedging Instrument |  |  |  |
Derivatives [Line Items] |  |  |  |
Current derivative financial assets | [2],[3] | 5,456 | 2,807 |
Non-current derivative financial assets | [2],[3] | 123,902 | 35,391 |
Current derivative financial liabilities | [2],[4] | 22,015 | 6,757 |
Non-current derivative financial liabilities | [2],[4] | 148,227 | 97,793 |
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) |  | 12,009 | (19,729) | 22,510
Net income effects of transaction gain (loss) |  | 15,586 | 6,761 | 0
Other comprehensive income (loss) | [1] | ₩ 0 | ₩ 0 | ₩ 0
[1] | Net gain (loss) on valuation of derivatives applying cash flow hedge accounting of ￦(24,415) million, ￦(3,654) million and ￦11,870 million, net of tax, are recognized as other comprehensive income (loss) for the years ended December 31, 2022, 2023 and 2024, 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 supply agreement (“PPA”) of its subsidiary Columboola Solar Farm Hold Co Pty., Ltd. as other derivatives.
[4] | In relation to the agreement to purchase hybrid bonds issued by Samcheok Eco Materials Co., Ltd., an associate of the Company, the performance obligation as of December 31, 2024 which amounts to ￦26,422 million (￦18,752 million as of December 31, 2023) to the underwriter of the bonds was recorded as other derivative liabilities.

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