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Inventories | 9 Months Ended
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Sep. 30, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories
| September 30, 2018 |  | December 31, 2017
Finished goods | $ | 667 |  |  | $ | 669 |
Work-in-process | 1,467 |  |  | 1,349 |
Purchased raw materials | 398 |  |  | 381 |
Operating supplies | 90 |  |  | 81 |
Total inventories | $ | 2,622 |  |  | $ | 2,480 |
At September 30, 2018 and December 31, 2017, the portion of inventories valued on a last-in, first-out (LIFO) basis was $1,339 and $1,208, respectively. If valued on an average-cost basis, total inventories would have been $534 and $481 higher at September 30, 2018 and December 31, 2017, respectively. In the second quarter of 2018, a charge of $23 was recorded in Cost of goods sold and Inventories to reflect a physical inventory adjustment at one plant in the EP&S segment. While a portion of this charge relates to prior years, the majority relates to 2018. The out-of-period amounts are not material to any interim or annual periods.

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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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