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Inventories | 12 Months Ended
--- | ---
Dec. 31, 2021
Inventory Disclosure [Abstract] |
Inventories | Inventories
December 31, | 2021 |  | 2020
Finished goods | $ | 478 |  |  | $ | 528 |
Work-in-process | 631 |  |  | 629 |
Purchased raw materials | 256 |  |  | 292 |
Operating supplies | 37 |  |  | 39 |
Total inventories | $ | 1,402 |  |  | $ | 1,488 |
At December 31, 2021 and 2020, the portion of inventories valued on a LIFO basis was $523 and $458, respectively. These amounts exclude the effects of LIFO valuation reductions, which were $192 and $131 at December 31, 2021 and 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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