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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories
December 31, | 2017 | 2016
Finished goods | $ | 669 |  | $ | 625 |
Work-in-process | 1,349 |  | 1,144 |
Purchased raw materials | 381 |  | 408 |
Operating supplies | 81 |  | 76 |
| $ | 2,480 |  | $ | 2,253 |
At December 31, 2017 and 2016, the total amount of inventories valued on a LIFO basis was $1,208 and $947, respectively. If valued on an average-cost basis, total inventories would have been $481 and $371 higher at December 31, 2017 and 2016, respectively. During 2017 and 2016, reductions in LIFO inventory quantities caused partial liquidations of the lower cost LIFO inventory base. These liquidations resulted in the recognition of immaterial income amounts in 2017, 2016, and 2015.

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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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