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Borrowings and Debt Securities - Repayment Schedule of Borrowings and Debt Securities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings ₩ 19,855,487 ₩ 15,435,895
Debt Securities 113,975,000 105,366,315
Less than 1 year    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 16,447,973 12,458,627
Debt Securities 24,681,439 10,205,395
1~5 Years    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,649,696 1,472,655
Debt Securities 64,342,617 65,278,587
Over 5 Years    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,757,818 1,504,613
Debt Securities ₩ 24,950,944 ₩ 29,882,333