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Inventories | 12 Months Ended
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Dec. 31, 2018
Inventories [Abstract] |
Inventories |
16. | Inventories
Inventories as of December 31, 2017 and 2018 are as follows:
|  |  |  |  | 2017 |
|  |  |  |  | Acquisition cost |  |  | Valuation allowance |  |  | Book value |
|  |  |  |  | In millions of won |
Raw materials |  | ￦ |  |  |  |  | 3,528,835 |  |  |  | (2,829 | ) |  |  | 3,526,006 |
Merchandise |  |  |  |  |  |  | 107 |  |  |  | — |  |  |  | 107 |
Work-in-progress |  |  |  |  |  |  | 138,709 |  |  |  | (1,028 | ) |  |  | 137,681 |
Finished goods |  |  |  |  |  |  | 72,923 |  |  |  | (1,517 | ) |  |  | 71,406 |
Supplies |  |  |  |  |  |  | 1,581,661 |  |  |  | (3,940 | ) |  |  | 1,577,721 |
Inventories in transit |  |  |  |  |  |  | 679,358 |  |  |  | — |  |  |  | 679,358 |
Other inventories |  |  |  |  |  |  | 9,807 |  |  |  | — |  |  |  | 9,807 |
|  | ￦ |  |  |  |  | 6,011,400 |  |  |  | (9,314 | ) |  |  | 6,002,086 |
|  |  |  |  | 2018 |
|  |  |  |  | Acquisition cost |  |  | Valuation allowance |  |  | Book value |
|  |  |  |  | In millions of won |
Raw materials |  | ￦ |  |  |  |  | 3,886,739 |  |  |  | (2,609 | ) |  |  | 3,884,130 |
Work-in-progress |  |  |  |  |  |  | 189,907 |  |  |  | (1,028 | ) |  |  | 188,879 |
Finished goods |  |  |  |  |  |  | 50,526 |  |  |  | — |  |  |  | 50,526 |
Supplies |  |  |  |  |  |  | 1,858,751 |  |  |  | (3,907 | ) |  |  | 1,854,844 |
Inventories in transit |  |  |  |  |  |  | 1,196,113 |  |  |  | — |  |  |  | 1,196,113 |
Other inventories |  |  |  |  |  |  | 13,761 |  |  |  | — |  |  |  | 13,761 |
|  | ￦ |  |  |  |  | 7,195,797 |  |  |  | (7,544 | ) |  |  | 7,188,253 |
The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventory deducted from cost of sales for the years ended December 31, 2016, 2017 and 2018 were ￦2,473 million, ￦437 million and ￦3,723 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2016, 2017 and 2018 were ￦2,683 million, ￦3,875 million and ￦1,953 million, respectively.

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