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Inventories (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | ₩ 3,884,130 | ₩ 3,526,006
Merchandise |  | 107
Work-in-progress | 188,879 | 137,681
Finished goods | 50,526 | 71,406
Supplies | 1,854,844 | 1,577,721
Inventories in transit | 1,196,113 | 679,358
Other inventories | 13,761 | 9,807
Total Inventories | 7,188,253 | 6,002,086
Acquisition cost |  |
Inventory [Line Items] |  |
Raw materials | 3,886,739 | 3,528,835
Merchandise |  | 107
Work-in-progress | 189,907 | 138,709
Finished goods | 50,526 | 72,923
Supplies | 1,858,751 | 1,581,661
Inventories in transit | 1,196,113 | 679,358
Other inventories | 13,761 | 9,807
Total Inventories | 7,195,797 | 6,011,400
Valuation allowance |  |
Inventory [Line Items] |  |
Raw materials | (2,609) | (2,829)
Merchandise |  | 0
Work-in-progress | (1,028) | (1,028)
Finished goods | 0 | (1,517)
Supplies | (3,907) | (3,940)
Inventories in transit | 0 | 0
Other inventories | 0 | 0
Total Inventories | ₩ (7,544) | ₩ (9,314)

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