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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventories [Abstract] |
Inventories |
14. | 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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