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Inventories, Net
 6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Inventories, Net Inventories, Net
Inventories, net consisted of the following:
June 30, 2022December 31, 2021
Raw materials$267 $265 
Work-in-process117 117 
Finished goods, net478 461 
Materials and supplies, net244 205 
Inventories, net – current$1,106 $1,048 
Materials and supplies, net consists of processing chemicals, maintenance supplies and spare parts, which will be consumed directly and indirectly in the production of our products.
At June 30, 2022 and December 31, 2021, inventory obsolescence reserves primarily for materials and supplies were $43 million and $43 million, respectively. Reserves for lower of cost or market and net realizable value were $5 million and $11 million at June 30, 2022 and December 31, 2021, respectively.