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Borrowings and Debt Securities - Repayment Schedule of Borrowings and Debt Securities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings ₩ 20,710,989 ₩ 19,855,487
Debt Securities 112,057,858 113,975,000
Less than 1 year    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 17,557,122 16,447,973
Debt Securities 26,908,467 24,681,439
1~5 Years    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,488,840 1,649,696
Debt Securities 63,087,182 64,342,617
Over 5 Years    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,665,027 1,757,818
Debt Securities ₩ 22,062,209 ₩ 24,950,944