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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.

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