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Inventories | 6 Months Ended
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Jun. 30, 2016
Inventory Disclosure [Abstract] |
Inventories | F. Inventories
|  | June 30, 2016 |  |  | December 31, 2015 |
Finished goods |  | $ | 827 |  |  | $ | 811 |
Work-in-process |  |  | 1,344 |  |  |  | 1,272 |
Bauxite and alumina |  |  | 416 |  |  |  | 445 |
Purchased raw materials |  |  | 650 |  |  |  | 720 |
Operating supplies |  |  | 201 |  |  |  | 194 |
|  | $ | 3,438 |  |  | $ | 3,442 |
At June 30, 2016 and December 31, 2015, the total amount of inventories valued on a LIFO basis was $1,335 and $1,373, respectively. If valued on an average-cost basis, total inventories would have been $567 and $559 higher at June 30, 2016 and December 31, 2015, 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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