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Financial Assets at Fair Value through Profit or Loss - Summary of Income (Loss) from Financial Assets at fair Value Through Profit or Loss (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financial Assets At Fair Value Through Profit Or Loss [Line Items]    
Gains (losses) on financial assets at fair value through profit or loss ₩ 34,444 ₩ 40,699
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 13,632 6,127
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 110 645
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 854 3,598
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 ₩ 19,848 ₩ 30,329