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Inventories | 3 Months Ended
--- | ---
Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories
| March 31, 2018 |  | December 31, 2017
Finished goods | $ | 718 |  |  | $ | 669 |
Work-in-process | 1,406 |  |  | 1,349 |
Purchased raw materials | 435 |  |  | 381 |
Operating supplies | 89 |  |  | 81 |
Total inventories | $ | 2,648 |  |  | $ | 2,480 |
At March 31, 2018 and December 31, 2017, the portion of inventories valued on a last-in, first-out (LIFO) basis was $1,302 and $1,208, respectively. If valued on an average-cost basis, total inventories would have been $495 and $481 higher at March 31, 2018 and December 31, 2017, respectively.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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