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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Income, expense, gains or losses of financial instruments      
Interest income ₩ 242,586 ₩ 268,118 ₩ 223,767
Dividends income 7,316 13,838 12,777
Gain (loss) on valuation of derivatives (455,715) 317,350 153,203
Gain (loss) on valuation of financial assets 40,699 32,233  
Interest expense of trade and other payables 88,757 94,019 42,830
Interest expense of others 540,867 558,464 505,112
Gain (loss) on repayment of financial liabilities 1,314 916 10,303
Cash and Cash Equivalents      
Income, expense, gains or losses of financial instruments      
Interest income 9,419 42,861 40,704
Financial assets at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Interest income 19,114 29,411 21,713
Gain (loss) on valuation of derivatives (52,447) 151,604 34,117
Gain (loss) on transaction of derivatives 36,563 63,329 39,114
Gain (loss) on valuation of financial assets 5,508 1,062 1,879
Gain on disposal of financial assets 11,344 1,760 1,837
Financial assets at fair value through other comprehensive income      
Income, expense, gains or losses of financial instruments      
Dividends income 7,316 13,838 12,777
Financial assets at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest income 612 539 89
Loans and receivables      
Income, expense, gains or losses of financial instruments      
Interest income 26,232 63,448 21,925
Trade and other receivables      
Income, expense, gains or losses of financial instruments      
Interest income 151,035 69,941 90,390
Short-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 25,540 49,070 41,025
Long-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 10,406 12,794 7,920
Other financial assets      
Income, expense, gains or losses of financial instruments      
Interest income 228 54 1
Derivative assets (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives (77,733) 123,730 69,799
Gain (loss) on transaction of derivatives 36,053 65,651 34,152
Gain (loss) on valuation of derivatives (equity, before tax) 9,925 38,305 8,600
Financial liabilities at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives (104,607) 27,686 (4,650)
Gain (loss) on transaction of derivatives (49,788) (493) 36,046
Financial liabilities carried at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest expense of borrowings and debt securities 1,365,801 1,394,328 1,320,516
Interest expense of trade and other payables 88,757 94,019 42,830
Interest expense of others 540,867 558,464 505,112
Gain (loss) on repayment of financial liabilities (35)    
Gain (loss) on foreign currency transactions and translations 739,244 (406,175) (356,159)
Derivative liabilities (using hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives (220,928) 14,330 53,937
Gain (loss) on transaction of derivatives 42,565 (42,072) 37,985
Gain (loss) on valuation of derivatives (equity, before tax) ₩ 101,295 ₩ (2,578) ₩ (15,029)