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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income, expense, gains or losses of financial instruments      
Interest income ₩ 268,118 ₩ 223,767 ₩ 206,143
Dividends income 13,838 12,777 11,477
Impairment of available-for-sale financial assets 0 0 (2,713)
Gain (loss) on valuation of derivatives 317,350 153,203 (874,667)
Gain (loss) on valuation of financial assets 32,233 25,430  
Interest expense of trade and other payables (94,019) (42,830) (57,160)
Interest expense of others (558,464) (505,112) (491,665)
Cash and Cash Equivalents      
Income, expense, gains or losses of financial instruments      
Interest income 42,861 40,704 35,474
Financial assets available-for-sale      
Income, expense, gains or losses of financial instruments      
Dividends income     11,477
Impairment of available-for-sale financial assets     (2,713)
Gain (loss) on disposal of available-for-sale financial assets     (1,213)
Financial assets at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Interest income 29,411 21,713 290
Gain (loss) on valuation of derivatives 151,604 34,117 (214,100)
Gain (loss) on transaction of derivatives 63,329 39,114 (37,266)
Gain (loss) on valuation of financial assets 1,062 1,879 12
Gain on disposal of financial assets 1,760 1,837  
Financial assets at fair value through other comprehensive income      
Income, expense, gains or losses of financial instruments      
Dividends income 13,838 12,777  
Financial assets at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest income 539 89  
Loans and receivables      
Income, expense, gains or losses of financial instruments      
Interest income 63,448 21,925 30,014
Trade and other receivables      
Income, expense, gains or losses of financial instruments      
Interest income 69,941 90,390 102,727
Held-to-maturity investments      
Income, expense, gains or losses of financial instruments      
Interest income     82
Short-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 49,070 41,025 29,412
Long-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 12,794 7,920 8,144
Other financial assets      
Income, expense, gains or losses of financial instruments      
Interest income 54 1  
Derivative assets (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 123,730 69,799 (41,129)
Gain (loss) on transaction of derivatives 65,651 34,152 (58,299)
Gain (loss) on valuation of derivatives (equity, before tax) 38,305 8,600 2,453
Financial liabilities carried at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest expense of borrowings and debt securities (1,394,328) (1,320,516) (1,240,727)
Interest expense of trade and other payables (94,019) (42,830) (57,160)
Interest expense of others (558,464) (505,112) (491,665)
Loss on retirement of financial liabilities     (5)
Gain (loss) on foreign currency transactions and translations (406,175) (356,159) 1,075,215
Financial liabilities at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 27,686 (4,650) (179,879)
Gain (loss) on transaction of derivatives (493) 36,046 (27,175)
Derivative liabilities (using hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 14,330 53,937 (439,559)
Gain (loss) on transaction of derivatives (42,072) 37,985 (46,221)
Gain (loss) on valuation of derivatives (equity, before tax) ₩ (2,578) ₩ (15,029) ₩ 29,431