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Borrowings and Debt Securities - Repayment schedule of borrowings and debt securities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings ₩ 4,453,611 ₩ 3,622,608
Debt Securities 56,695,855 51,232,007
Less than 1 year    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,173,596 1,166,871
Debt Securities 6,790,778 7,961,182
1~5 Years    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,911,226 1,117,222
Debt Securities 30,175,734 25,047,075
Over 5 Years    
Repayment schedule of borrowings and debt securities [Line Items]    
Borrowings 1,368,789 1,338,515
Debt Securities ₩ 19,729,343 ₩ 18,223,750