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Non-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Other Current Assets    
Non-Financial Assets [Line Items]    
Advance payment ₩ 147,784 ₩ 156,073
Prepaid Expense [1] 308,017 290,944
Miscellaneous Non-Financial Assets    
Greenhouse gas emissions rights 437,562 93,749
Other quick assets [2] 313,014 338,122
Miscellaneous Non-Financial Assets [3] 750,576 431,871
Non-Financial Assets 1,206,377 878,888
Other Noncurrent Assets    
Non-Financial Assets [Line Items]    
Advance payment 2,694 160,628
Prepaid Expense [1] 84,421 90,449
Miscellaneous Non-Financial Assets    
Greenhouse gas emissions rights 0 0
Other quick assets [2] 79,814 76,075
Miscellaneous Non-Financial Assets [3] 79,814 76,075
Non-Financial Assets ₩ 166,929 ₩ 327,152
[1] Prepaid expenses of W4,353 million as of December 31, 2018 was recorded as right-of-assets as of December 31, 2019 due to change in accounting policy.
[2] The Company recognized W92,128 million of its rights in connection with the securities of Orano Expansion as non-current non-financial assets as of December 31, 2018. The Company recognized an impairment loss of W87,023 million as it was determined that there is objective evidence of impairment related to its rights to equity interest in and loans to Orano Expansion for the year ended December 31, 2018. In addition, during the current year, the Company converted its loans with Orano Expansion into equity. The Company recognized an impairment loss of W49,201 million as it was determined that there is objective evidence of impairment related to the rights of equity interest in Orano Expansion.
[3] Details of others as of December 31, 2018 and 2019 are as follows: