v3.26.1
Derecognition And Offset Of Financial Instruments - Transferred Financial Assets That Do Not Meet The Condition Of Derecognition In Their Entirety (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of assets transferred ₩ 7,000,373 ₩ 1,561,140
Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Nature of financial assets transferred during period which do not qualify for derecognition Nomura Financial Investment (Korea) Co., Ltd Nomura Financial Investment (Korea) Co., Ltd
Book value of assets transferred ₩ 101,439 ₩ 0
Financial assets at FVTOCI    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of assets transferred 5,053,180 248,394
Financial assets at FVTPL    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of assets transferred 1,935,048 1,271,304
Securities at amortized cost    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of assets transferred 12,145 41,442
Bonds sold under repurchase agreements    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of Related liabilities ₩ 6,678,468 ₩ 1,530,767
Korean treasury and government bonds    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Nature of financial assets transferred during period which do not qualify for derecognition Korea Securities Depository and others Korea Securities Depository and others
Book value of assets transferred ₩ 5,573,299 ₩ 0
Korean treasury and government bonds | Financial assets at fair value through profit or loss, category    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Nature of financial assets transferred during period which do not qualify for derecognition The Korea Securities Finance Corporation The Korea Securities Finance Corporation
Book value of assets transferred ₩ 0 ₩ 12,361
Assets transferred | Loans At Amortized Costs    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of assets transferred [1] 4,194,597 5,205,022
Related liabilities | Asset Backed Borrowings    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of Related liabilities [1] 2,187,733 2,153,730
Related liabilities | Asset Backed Bonds    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Book value of Related liabilities [1] ₩ 1,212,423 ₩ 1,830,672
[1] The carrying amount is the amount before the allowance for bad debts.