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Non-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Current Assets    
Non-Financial Assets [Line Items]    
Advance payment ₩ 169,737 ₩ 147,784
Prepaid Expense 216,073 308,017
Miscellaneous Non-Financial Assets    
Greenhouse gas emissions rights 357,355 437,562
Other quick assets [1] 276,993 313,014
Miscellaneous Non-Financial Assets 634,348 750,576
Non-Financial Assets 1,020,158 1,206,377
Other Noncurrent Assets    
Non-Financial Assets [Line Items]    
Advance payment 32,693 2,694
Prepaid Expense 140,730 84,421
Miscellaneous Non-Financial Assets    
Greenhouse gas emissions rights 0 0
Other quick assets [1] 72,969 79,814
Miscellaneous Non-Financial Assets 72,969 79,814
Non-Financial Assets ₩ 246,392 ₩ 166,929
[1] The Company recognized an impairment loss of KRW49,201 million as it was determined that there is an objective evidence of impairment related to its rights to equity interest in Orano Expansion for the year ended December 31, 2019.