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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventories [Abstract] |
Inventories | Inventories as of December 31, 2019 and 2020 are as follows:
|  |  |  |  | 2019 |
|  |  |  |  | Acquisition cost |  |  | Valuation allowance |  |  | Book value |
|  |  |  |  | In millions of won |
Raw materials |  | ￦ |  |  |  |  | 3,790,443 |  |  |  | (1,430 | ) |  |  | 3,789,013 |
Merchandises |  |  |  |  |  |  | 340 |  |  |  | — |  |  |  | 340 |
Work-in-progress |  |  |  |  |  |  | 165,073 |  |  |  | — |  |  |  | 165,073 |
Finished goods |  |  |  |  |  |  | 58,280 |  |  |  | — |  |  |  | 58,280 |
Supplies |  |  |  |  |  |  | 2,121,363 |  |  |  | (4,369 | ) |  |  | 2,116,994 |
Inventories-in-transit |  |  |  |  |  |  | 906,267 |  |  |  | — |  |  |  | 906,267 |
Other inventories |  |  |  |  |  |  | 14,733 |  |  |  | — |  |  |  | 14,733 |
|  | ￦ |  |  |  |  | 7,056,499 |  |  |  | (5,799 | ) |  |  | 7,050,700 |
|  |  |  |  | 2020 |
|  |  |  |  | Acquisition cost |  |  | Valuation allowance |  |  | Book value |
|  |  |  |  | In millions of won |
Raw materials |  | ￦ |  |  |  |  | 3,602,073 |  |  |  | (885 | ) |  |  | 3,601,188 |
Merchandises |  |  |  |  |  |  | 234 |  |  |  | — |  |  |  | 234 |
Work-in-progress |  |  |  |  |  |  | 148,067 |  |  |  | — |  |  |  | 148,067 |
Finished goods |  |  |  |  |  |  | 42,070 |  |  |  | — |  |  |  | 42,070 |
Supplies |  |  |  |  |  |  | 2,280,682 |  |  |  | (7,892 | ) |  |  | 2,272,790 |
Inventories-in-transit |  |  |  |  |  |  | 666,967 |  |  |  | — |  |  |  | 666,967 |
Other inventories |  |  |  |  |  |  | 11,593 |  |  |  | — |  |  |  | 11,593 |
|  | ￦ |  |  |  |  | 6,751,686 |  |  |  | (8,777 | ) |  |  | 6,742,909 |
The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventories deducted from cost of sales for the years ended December 31, 2018, 2019 and 2020 were ￦3,723 million , ￦4,872 million and ￦2,020 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2018, 2019 and 2020 were ￦1,953 million, ￦3,127 million and ￦4,998 million, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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