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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Income, expense, gains or losses of financial instruments      
Interest income ₩ 223,767 ₩ 206,143 ₩ 241,778
Dividend income 12,777 11,477 9,446
Impairment of available-for-sale financial assets   (2,713) (86,703)
Gain (loss) on valuation of derivatives 153,203 (874,667) 288,068
Gain (loss) on transaction of derivatives 147,297    
Gain (loss) on valuation of derivatives (equity, before tax) (6,429)    
Gain (loss) on valuation of financial assets 1,879 12 0
Gain on disposal of financial assets 1,837    
Interest expense of borrowings and debt securities (1,320,516)    
Interest expense of trade and other payables (42,830) (57,160) (68,375)
Interest expense of others (505,112) (491,665) (482,428)
Gain (loss) on foreign currency transactions and translations (356,159)    
Cash and Cash Equivalents      
Income, expense, gains or losses of financial instruments      
Interest income 40,704 35,474 61,380
Financial assets available-for-sale      
Income, expense, gains or losses of financial instruments      
Dividend income   11,477 9,446
Impairment of available-for-sale financial assets   (2,713) (86,703)
Gain (loss) on disposal of available-for-sale financial assets   (1,213) 1,473
Financial assets at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest income 89    
Held-to-maturity investments      
Income, expense, gains or losses of financial instruments      
Interest income   82 97
Loans and receivables      
Income, expense, gains or losses of financial instruments      
Interest income 21,925 30,014 25,106
Trade and other receivables      
Income, expense, gains or losses of financial instruments      
Interest income 90,390 102,727 102,237
Short-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 41,025 29,412 45,763
Long-term financial instruments      
Income, expense, gains or losses of financial instruments      
Interest income 7,920 8,144 7,195
Other financial assets      
Income, expense, gains or losses of financial instruments      
Interest income 1    
Financial assets at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Interest income 21,713 290  
Gain (loss) on valuation of derivatives 34,117 (214,100) 113,671
Gain (loss) on transaction of derivatives 39,114 (37,266) (8,039)
Gain (loss) on valuation of financial assets 1,879 12  
Gain on disposal of financial assets 1,837    
Financial assets at fair value through other comprehensive income      
Income, expense, gains or losses of financial instruments      
Dividend income 12,777    
Derivative assets (applying hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 69,799 (41,129) 145,458
Gain (loss) on transaction of derivatives 34,152 (58,299) (13,994)
Gain (loss) on valuation of derivatives (equity, before tax) [1] 8,600 2,453 50,047
Financial liabilities carried at amortized cost      
Income, expense, gains or losses of financial instruments      
Interest expense of borrowings and debt securities (1,320,516) (1,240,727) (1,202,065)
Interest expense of trade and other payables (42,830) (57,160) (68,375)
Interest expense of others (505,112) (491,665) (482,428)
Loss on retirement of financial liabilities   (5) (23,000)
Gain (loss) on foreign currency transactions and translations (356,159) 1,075,215 (290,485)
Financial liabilities at fair value through profit or loss      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives (4,650) (179,879) 23,225
Gain (loss) on transaction of derivatives 36,046 (27,175) 17,045
Derivative liabilities (using hedge accounting)      
Income, expense, gains or losses of financial instruments      
Gain (loss) on valuation of derivatives 53,937 (439,559) 5,714
Gain (loss) on transaction of derivatives 37,985 (46,221) (51,450)
Gain (loss) on valuation of derivatives (equity, before tax) [1] ₩ (15,029) ₩ 29,431 ₩ (3,297)
[1] Items are included in other comprehensive income or loss. All other income and gain amounts listed above are included in finance income, and all expense and losses listed above are included in finance expenses in the consolidated statements of comprehensive income or loss.