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Restricted Deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Restricted Deposits [Line Items] |  |  |
Total Restricted Deposits |  | ₩ 1,295,758 | ₩ 1,173,068
Cash and Cash Equivalents |  |  |
Restricted Deposits [Line Items] |  |  |
Escrow accounts |  | 544 | 0
Deposits for government project |  | 5,066 | 9,287
Collateral provided for borrowings |  | 117,747 | 63,198
Collateral provided for lawsuit |  | 42 | 3
Deposits for transmission regional support program |  | 5,469 | 3,002
Total Restricted Deposits |  | 128,868 | 75,490
Short-term financial instruments |  |  |
Restricted Deposits [Line Items] |  |  |
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises |  | 109,000 | 93,000
Total Restricted Deposits |  | 109,000 | 93,000
Current financial assets at fair value through profit or loss |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | 0 | 0
Total Restricted Deposits |  | 0 | 0
Non-Current financial assets at fair value through profit or loss |  |  |
Restricted Deposits [Line Items] |  |  |
Decommissioning costs of nuclear power plants |  | 577,481 | 541,969
Total Restricted Deposits |  | 577,481 | 541,969
Long-term financial instruments |  |  |
Restricted Deposits [Line Items] |  |  |
Escrow accounts |  | 76 | 74
Collateral provided for borrowings |  | 11,745 | 11,745
Decommissioning costs of nuclear power plants |  | 258,282 | 250,464
Guarantee deposits for banking accounts at oversea branches |  | 306 | 326
Funds for developing small and medium enterprises | [1] | 210,000 | 200,000
Total Restricted Deposits |  | ₩ 480,409 | ₩ 462,609
[1] | Deposits for small and medium enterprise at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses as of December 31, 2019 and 2020.

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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=120398452&loc=d3e534808-122878 + Details
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