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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Income, expense, gains or losses of financial instruments      
Dividends income ₩ 28,875 ₩ 10,522 ₩ 7,316
Gain (loss) on valuation of derivatives 224,218 822,994 (455,715)
Gain (loss) on valuation of financial assets 32,661 34,444  
Interest expense of trade and other payables 204,078 213,765 88,757
Interest expense of others 472,248 384,423 540,867
Other finance income 925 1,284 1,470
Other finance expenses 25,144 4,058 4,456
Cash and cash equivalents      
Income, expense, gains or losses of financial instruments      
Interest income 51,872 12,692 9,419
Gain (loss) on foreign currency transactions and translations 22,158 34,923 (15,911)
Financial assets at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Interest income 58,540 18,415 19,114
Dividends income 1,994 2,949 4,734
Gain (loss) on valuation of derivatives 336,049 450,896 (52,447)
Gain (loss) on transaction of derivatives 205,298 54,352 36,563
Gain (loss) on valuation of financial assets (37,230) 8,858 5,508
Gain on disposal of financial assets 9,358 4,221 11,344
Financial assets at fair value through other comprehensive income      
Income, expense, gains or losses of financial instruments      
Dividends income 26,881 7,573 2,582
Financial assets at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest income 1,308 797 612
Gain (loss) on foreign currency transactions and translations 5,087 (3,647) (1,733)
Loans and receivables      
Income, expense, gains or losses of financial instruments      
Interest income 33,545 25,196 26,232
Gain (loss) on foreign currency transactions and translations 596 729 (527)
Trade and other receivables      
Income, expense, gains or losses of financial instruments      
Interest income 164,653 144,543 151,035
Gain on disposal of financial assets 0 2,452 0
Gain (loss) on foreign currency transactions and translations 1,019 14,207 23,458
Short-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 15,827 7,531 25,540
Gain (loss) on foreign currency transactions and translations 3,513 32,218 (38,088)
Long-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 14,371 12,470 10,406
Gain (loss) on foreign currency transactions and translations 1 27 0
Other financial assets      
Income, expense, gains or losses of financial instruments      
Interest income 637 230 228
Derivative (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 149,888 211,180 (77,733)
Gain (loss) on transaction of derivatives 54,422 31,351 36,053
Gain (loss) on valuation of derivatives (equity, before tax) (93,699) (11,734) 9,925
Financial liabilities at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives (345,313) 2,751 (104,607)
Gain (loss) on transaction of derivatives (110,236) (15,358) (49,788)
Financial liabilities carried at amortized cost      
Income, expense, gains or losses of financial instruments      
Gain (loss) on repayment of financial liabilities (15) (10) (35)
Gain (loss) on foreign currency transactions and translations (936,269) (1,162,835) 772,045
Interest expense of borrowings and debt securities 2,142,220 1,316,269 1,365,801
Interest expense of trade and other payables 204,078 213,765 88,757
Interest expense of others 472,248 384,423 540,867
Other finance income 927 1,284 0
Other finance expenses 167 2,504 0
Derivatives (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 83,594 158,167 (220,928)
Gain (loss) on transaction of derivatives 75,201 13,737 42,565
Gain (loss) on valuation of derivatives (equity, before tax) ₩ 28,647 ₩ (28,726) ₩ 101,295