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Inventories (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Inventory [Line Items] |  |
Raw materials | ₩ 3,601,188 | ₩ 3,789,013
Merchandise | 234 | 340
Work-in-progress | 148,067 | 165,073
Finished goods | 42,070 | 58,280
Supplies | 2,272,790 | 2,116,994
Inventories in transit | 666,967 | 906,267
Other inventories | 11,593 | 14,733
Total Inventories | 6,742,909 | 7,050,700
Acquisition cost |  |
Inventory [Line Items] |  |
Raw materials | 3,602,073 | 3,790,443
Merchandise | 234 | 340
Work-in-progress | 148,067 | 165,073
Finished goods | 42,070 | 58,280
Supplies | 2,280,682 | 2,121,363
Inventories in transit | 666,967 | 906,267
Other inventories | 11,593 | 14,733
Total Inventories | 6,751,686 | 7,056,499
Valuation allowance |  |
Inventory [Line Items] |  |
Raw materials | (885) | (1,430)
Supplies | (7,892) | (4,369)
Total Inventories | ₩ (8,777) | ₩ (5,799)

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