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Non-Financial Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Non-Financial Assets [Abstract] |
Non-Financial Assets | Non-financial assets as of December 31, 2017 and 2018 are as follows:
|  | 2017 |  |  | 2018 |
| Current |  |  | Non-current |  |  | Current |  |  | Non-current |
|  | In millions of won |
Advance payment |  | ￦ | 109,743 |  |  |  | 43,872 |  |  |  | 156,073 |  |  |  | 160,628 |
Prepaid expenses |  |  | 251,715 |  |  |  | 90,118 |  |  |  | 290,944 |  |  |  | 90,449 |
Others(*1) |  |  | 392,534 |  |  |  | 112,828 |  |  |  | 431,871 |  |  |  | 76,075 |
|  | ￦ | 753,992 |  |  |  | 246,818 |  |  |  | 878,888 |  |  |  | 327,152 |
| (*1) | Details of others as of December 31, 2017 and 2018 are as follows:
|  |  |  |  | 2017 |  |  | 2018 |
|  |  |  | Current |  |  | Non-current |  |  | Current |  |  | Non-current |
|  |  |  |  | In millions of won |
Tax refund receivables |  | ￦ |  |  |  |  | 89,762 |  |  |  | 1,940 |  |  |  | 82,348 |  |  |  | 1,276 |
Greenhouse gas emissions rights |  |  |  |  |  |  | 135,211 |  |  |  | — |  |  |  | 93,749 |  |  |  | — |
Other quick assets(*2) |  |  |  |  |  |  | 167,561 |  |  |  | 110,888 |  |  |  | 255,774 |  |  |  | 74,799 |
|  | ￦ |  |  |  |  | 392,534 |  |  |  | 112,828 |  |  |  | 431,871 |  |  |  | 76,075 |
| (*2) | The Company has recognized ￦92,128 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 ￦87,023 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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