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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2021
Classes of current inventories [abstract] |
Inventories | Inventories as of December 31, 2020 and 2021 are as follows:
|  |  |  |  | 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 |
|  |  |  |  | 2021 |
|  |  |  |  | Acquisition cost |  |  | Valuation allowance |  |  | Book value |
|  |  |  |  | In millions of won |
Raw materials |  | ￦ |  |  |  |  | 3,655,588 |  |  |  | (1,247 | ) |  |  | 3,654,341 |
Merchandises |  |  |  |  |  |  | 512 |  |  |  | — |  |  |  | 512 |
Work-in-progress |  |  |  |  |  |  | 180,220 |  |  |  | — |  |  |  | 180,220 |
Finished goods |  |  |  |  |  |  | 27,254 |  |  |  | — |  |  |  | 27,254 |
Supplies |  |  |  |  |  |  | 2,541,028 |  |  |  | (3,869 | ) |  |  | 2,537,159 |
Inventories-in-transit |  |  |  |  |  |  | 1,195,148 |  |  |  | — |  |  |  | 1,195,148 |
Other inventories |  |  |  |  |  |  | 13,548 |  |  |  | — |  |  |  | 13,548 |
|  | ￦ |  |  |  |  | 7,613,298 |  |  |  | (5,116 | ) |  |  | 7,608,182 |
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, 2019, 2020 and 2021 were ￦4,872 million, ￦2,020 million and ￦11,422 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2019, 2020 and 2021 were ￦3,127 million, ￦4,998 million and ￦7,761 million, respectively.

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