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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventories [Abstract] |
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 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration