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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
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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

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- Definition The amount of bonds issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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