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Non-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Current Assets [Member]    
Non-Financial Assets [Line Items]    
Advance payment ₩ 109,743 ₩ 93,279
Prepaid Expense 251,715 228,142
Miscellaneous Non-Financial Assets [Abstract]    
Tax refund receivables 89,762 30,959
Greenhouse gas emissions rights 135,211 145,105
Other quick assets [1] 167,561 134,375
Miscellaneous Non-Financial Assets [2] 392,534 310,439
Non-Financial Assets 753,992 631,860
Other Noncurrent Assets [Member]    
Non-Financial Assets [Line Items]    
Advance payment 43,872 71,238
Prepaid Expense 90,118 78,066
Miscellaneous Non-Financial Assets [Abstract]    
Tax refund receivables 1,940 2,188
Other quick assets [1] 110,888 30,297
Miscellaneous Non-Financial Assets [2] 112,828 32,485
Non-Financial Assets ₩ 246,818 ₩ 181,789
[1] The Company has recognized ￦92,128 million of shares in Orano Expansion (formerly, AREVA NC Expansion) as non-current non-financial assets.
[2] Details of others as of December 31, 2016 and 2017 are as follows: