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Inventories | 6 Months Ended
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Jun. 30, 2021
Inventory Disclosure [Abstract] |
Inventories | Inventories
| June 30, 2021 |  | December 31, 2020
Finished goods | $ | 500 |  |  | $ | 528 |
Work-in-process | 656 |  |  | 629 |
Purchased raw materials | 263 |  |  | 292 |
Operating supplies | 37 |  |  | 39 |
Total inventories | $ | 1,456 |  |  | $ | 1,488 |
At June 30, 2021 and December 31, 2020, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $490 and $458, respectively. If valued on an average-cost basis, total inventories would have been $152 and $131 higher at June 30, 2021 and December 31, 2020, 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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