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Borrowings and Debt Securities - Repayment schedule of borrowings and debt securities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | ₩ 5,133,802 | ₩ 4,727,186
Debt Securities | 64,753,535 | 63,261,668
Less than 1 year |  |
Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | 2,114,904 | 1,316,134
Debt Securities | 8,565,301 | 7,545,485
1~5 Years |  |
Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | 1,564,252 | 2,113,404
Debt Securities | 28,746,117 | 31,552,963
Over 5 Years |  |
Repayment schedule of borrowings and debt securities [Line Items] |  |
Borrowings | 1,454,646 | 1,297,648
Debt Securities | ₩ 27,442,117 | ₩ 24,163,220

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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