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Non-Financial Assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other Current Assets |  |  |
Non-Financial Assets [Line Items] |  |  |
Advance payment |  | ₩ 156,073 | ₩ 109,743
Prepaid Expense |  | 290,944 | 251,715
Miscellaneous Non-Financial Assets |  |  |
Tax refund receivables |  | 82,348 | 89,762
Greenhouse gas emissions rights |  | 93,749 | 135,211
Other quick assets | [1] | 255,774 | 167,561
Miscellaneous Non-Financial Assets |  | 431,871 | 392,534
Non-Financial Assets |  | 878,888 | 753,992
Other Noncurrent Assets |  |  |
Non-Financial Assets [Line Items] |  |  |
Advance payment |  | 160,628 | 43,872
Prepaid Expense |  | 90,449 | 90,118
Miscellaneous Non-Financial Assets |  |  |
Tax refund receivables |  | 1,276 | 1,940
Greenhouse gas emissions rights |  | 0 | 0
Other quick assets | [1] | 74,799 | 110,888
Miscellaneous Non-Financial Assets |  | 76,075 | 112,828
Non-Financial Assets |  | ₩ 327,152 | ₩ 246,818
[1] | The Company has recognized KRW92,128 million of its rights in connection with the securities of Orano Expansion as non-current non-financial assets as of December 31, 2017 and 2018. The Company recognized an impairment loss of KRW87,023 million as it was determined that there is objective evidence of impairment related to its equity interest in and loans to Orano Expansion for the year ended December 31, 2018.

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