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Derivatives - Summary of Derivative Financial Instruments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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.