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Inventories | 12 Months Ended
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Dec. 31, 2022
Inventory Disclosure [Abstract] |
Inventories | Inventories
December 31, | 2022 |  | 2021
Finished goods | $ | 490 |  |  | $ | 478 |
Work-in-process | 748 |  |  | 631 |
Purchased raw materials | 317 |  |  | 256 |
Operating supplies | 54 |  |  | 37 |
Total inventories | $ | 1,609 |  |  | $ | 1,402 |
At December 31, 2022 and 2021, the portion of total inventories valued on a LIFO basis was $441 and $331, respectively. If valued on an average-cost basis, total inventories would have been $220 and $192 higher at December 31, 2022 and 2021, respectively. During 2022 and 2020, reductions in LIFO inventory quantities caused partial liquidations of LIFO inventory layers. These liquidations resulted in the recognition of expense of less than $1 in 2022 and 2020. In 2021, we did not have any LIFO inventory layer liquidations.

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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 https://asc.fasb.org/topic&trid=2126998 + Details
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