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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.