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Classification of Financial Instruments - Classification of Comprehensive Income (Loss) from Financial Instruments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income, expense, gains or losses of financial instruments      
Interest income ₩ 467,525 ₩ 429,620 ₩ 340,753
Dividends income 70,601 25,941 28,875
Gain on valuation of derivatives 2,103,711 234,199 224,218
Gain on transaction of derivatives 302,657 89,659 224,685
Gain (loss) on valuation of derivatives (equity, before tax) [1] 20,306 (8,518) (65,052)
Interest expense of trade and other payables 191,918 200,440 204,078
Interest expense of others 668,115 614,332 472,248
Other finance income 8,882 4,970 925
Other finance expenses 20,086 2,513 25,144
Cash and cash equivalents      
Income, expense, gains or losses of financial instruments      
Interest income 102,505 100,205 51,872
Gain on foreign currency transactions and translations 17,498 (2,073) 22,158
Financial assets at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Interest income 54,385 65,470 58,540
Dividends income 4,813 4,193 1,994
Gain on valuation of derivatives 1,396,350 144,797 336,049
Gain on transaction of derivatives 129,471 130,230 205,298
Gain (loss) on valuation of financial assets 69,161 128,307 (37,230)
Gain (loss) on disposal of financial assets 45,059 13,161 9,358
Financial assets at fair value through other comprehensive income      
Income, expense, gains or losses of financial instruments      
Dividends income 65,788 21,748 26,881
Financial assets at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest income 2,859 2,929 1,308
Gain on foreign currency transactions and translations 5,568 (1,774) 5,087
Loans and receivables      
Income, expense, gains or losses of financial instruments      
Interest income 45,511 44,029 33,545
Gain on foreign currency transactions and translations 3,685 127 596
Trade and other receivables      
Income, expense, gains or losses of financial instruments      
Interest income 209,675 168,303 164,653
Gain on foreign currency transactions and translations 121,193 27,363 1,019
Short-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 31,766 34,260 15,827
Gain on foreign currency transactions and translations 0 0 3,513
Long-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 20,562 14,183 14,371
Gain on foreign currency transactions and translations 3 0 1
Other financial assets      
Income, expense, gains or losses of financial instruments      
Interest income 262 241 637
Derivative (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain on valuation of derivatives 410,088 76,814 149,888
Gain on transaction of derivatives 14,801 19,604 54,422
Gain (loss) on valuation of derivatives (equity, before tax) 21,443 (10,539) (93,699)
Financial liabilities at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Gain on valuation of derivatives 52,515 961 (345,313)
Gain on transaction of derivatives 146,417 (80,640) (110,236)
Financial liabilities carried at amortized cost      
Income, expense, gains or losses of financial instruments      
Loss on repayment of financial liabilities 0 0 (15)
Loss on foreign currency transactions and translations (2,643,230) (420,203) (936,269)
Interest expense of borrowings and debt securities 3,805,062 3,636,887 2,142,220
Interest expense of trade and other payables 191,918 200,440 204,078
Interest expense of others 668,115 614,332 472,248
Other finance income 8,882 4,971 927
Other finance expenses 4,177 1,796 167
Derivatives (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain on valuation of derivatives 244,758 11,627 83,594
Gain on transaction of derivatives 11,968 20,465 75,201
Gain (loss) on valuation of derivatives (equity, before tax) ₩ (1,137) ₩ 2,021 ₩ 28,647
[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.