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Borrowings and Debt Securities - Repayment schedule of borrowings and debt securities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | ₩ 4,727,186 | ₩ 4,453,611
Debt Securities | 63,261,668 | 56,695,855
Less than 1 year |  |
Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | 1,316,134 | 1,173,596
Debt Securities | 7,545,485 | 6,790,778
1~5 Years |  |
Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | 2,113,404 | 1,911,226
Debt Securities | 31,552,963 | 30,175,734
Over 5 Years |  |
Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | 1,297,648 | 1,368,789
Debt Securities | ₩ 24,163,220 | ₩ 19,729,343

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