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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | Inventories
December 31, | 2020 |  | 2019
Finished goods | $ | 528 |  |  | $ | 524 |
Work-in-process | 629 |  |  | 741 |
Purchased raw materials | 292 |  |  | 299 |
Operating supplies | 39 |  |  | 43 |
Total inventories | $ | 1,488 |  |  | $ | 1,607 |
At December 31, 2020 and 2019, the portion of inventories valued on a LIFO basis was $458 and $503, respectively. If valued on an average-cost basis, total inventories would have been $131 and $133 higher at December 31, 2020 and 2019, 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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