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Gains (losses) on financial assets at fair value through profit or loss (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial Assets At Fair Value Through Profit Or Loss [Line Items]    
Gains (losses) on financial assets at fair value through profit or loss ₩ 32,233 ₩ 25,430
Financial assets at fair value through profit or loss | Beneficiary securities    
Financial Assets At Fair Value Through Profit Or Loss [Line Items]    
Gains (losses) on financial assets at fair value through profit or loss 12,458 6,892
Financial assets at fair value through profit or loss | Cooperative securities    
Financial Assets At Fair Value Through Profit Or Loss [Line Items]    
Gains (losses) on financial assets at fair value through profit or loss 76 626
Financial assets at fair value through profit or loss | Debt with embedded derivatives    
Financial Assets At Fair Value Through Profit Or Loss [Line Items]    
Gains (losses) on financial assets at fair value through profit or loss 2,697 4,804
Financial assets at fair value through profit or loss | Other    
Financial Assets At Fair Value Through Profit Or Loss [Line Items]    
Gains (losses) on financial assets at fair value through profit or loss ₩ 17,002 ₩ 13,108