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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Income, expense, gains or losses of financial instruments      
Dividends income ₩ 10,522 ₩ 7,316 ₩ 13,838
Gain (loss) on valuation of derivatives 822,994 (455,715) 317,350
Gain (loss) on valuation of financial assets 34,444 40,699  
Interest expense of trade and other payables 213,765 88,757 94,019
Interest expense of others 384,423 540,867 558,464
Other finance income 1,284 1,470 0
Other finance expenses 4,058 4,456 2,555
Cash and Cash Equivalents      
Income, expense, gains or losses of financial instruments      
Interest income 12,692 9,419 42,861
Gain (loss) on foreign currency transactions and translations 34,923 (15,911) (3,332)
Financial assets at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Interest income 18,415 19,114 29,411
Dividends income 2,949 4,734 6,984
Gain (loss) on valuation of derivatives 450,896 (52,447) 151,604
Gain (loss) on transaction of derivatives 54,352 36,563 63,329
Gain (loss) on valuation of financial assets 8,858 5,508 1,062
Gain on disposal of financial assets 4,221 11,344 1,760
Financial assets at fair value through other comprehensive income      
Income, expense, gains or losses of financial instruments      
Dividends income 7,573 2,582 6,854
Financial assets at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest income 797 612 539
Gain (loss) on foreign currency transactions and translations (3,647) (1,733) (690)
Loans and receivables      
Income, expense, gains or losses of financial instruments      
Interest income 25,196 26,232 63,448
Gain (loss) on foreign currency transactions and translations 729 (527) (631)
Trade and other receivables      
Income, expense, gains or losses of financial instruments      
Interest income 144,543 151,035 69,941
Gain on disposal of financial assets 2,452    
Gain (loss) on foreign currency transactions and translations 14,207 23,458 (31,500)
Short-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 7,531 25,540 49,070
Gain (loss) on foreign currency transactions and translations 32,218 (38,088) 39,845
Long-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 12,470 10,406 12,794
Gain (loss) on foreign currency transactions and translations 27 0 0
Other financial assets      
Income, expense, gains or losses of financial instruments      
Interest income 230 228 54
Derivative (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 211,180 (77,733) 123,730
Gain (loss) on transaction of derivatives 31,351 36,053 65,651
Gain (loss) on valuation of derivatives (equity, before tax) (11,734) 9,925 38,305
Financial liabilities at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 2,751 (104,607) 27,686
Gain (loss) on transaction of derivatives (15,358) (49,788) (493)
Financial liabilities carried at amortized cost      
Income, expense, gains or losses of financial instruments      
Gain (loss) on repayment of financial liabilities (10) (35) 0
Gain (loss) on foreign currency transactions and translations (1,162,835) 772,045 (409,867)
Interest expense of borrowings and debt securities 1,316,269 1,365,801 1,394,328
Interest expense of trade and other payables 213,765 88,757 94,019
Interest expense of others 384,423 540,867 558,464
Other finance income 1,284 0 0
Other finance expenses 2,504 0 0
Derivatives (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 158,167 (220,928) 14,330
Gain (loss) on transaction of derivatives 13,737 42,565 (42,072)
Gain (loss) on valuation of derivatives (equity, before tax) ₩ (28,726) ₩ 101,295 ₩ (2,578)