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Restricted Deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Restricted Deposits [Line Items] |  |  |
Total Restricted Deposits |  | ₩ 1,126,975 | ₩ 991,634
Cash and Cash Equivalents |  |  |
Restricted Deposits [Line Items] |  |  |
Escrow accounts |  | 0 | 53
Deposits for government project |  | 12,747 | 15,365
Collateral provided for borrowings |  | 100,998 | 79,569
Collateral provided for lawsuit |  | 3 | 2
Deposits for transmission regional support program |  | 4,337 | 2,320
Decommissioning costs of nuclear power plants |  | 604 | 0
Financial assets available-for-sale |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | 0 | 214,156
Short-term financial instruments |  |  |
Restricted Deposits [Line Items] |  |  |
Bidding guarantees |  | 0 | 119
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises |  | 34,000 | 34,000
Long-term financial instruments |  |  |
Restricted Deposits [Line Items] |  |  |
Escrow accounts |  | 69 | 0
Decommissioning costs of nuclear power plants |  | 245,896 | 337,234
Guarantee deposits for checking account |  | 0 | 2
Guarantee deposits for banking accounts at oversea branches |  | 315 | 302
Funds for developing small and medium enterprises | [1] | 200,000 | 200,000
Current Financial assets at fair value through other comprehensive income |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | 29,451 | 0
Non-Current Financial assets at fair value through other comprehensive income |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | 498,555 | 0
Financial assets at fair value through other comprehensive income |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | ₩ 0 | ₩ 108,512
[1] | Deposits for small and medium enterprise at IBK and others for construction of Bitgaram Energy Valley and support for the high potential businesses as of December 31, 2017 and 2018.

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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