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Inventory
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventory
(3) Inventory

Inventories consisted of the following:
December 31,
(in millions)20232022
Finished goods$260 $297 
Raw materials226 206 
In-process inventories21 35 
Parts, supplies and other97 86 
Total inventories$604 $624 

At December 31, 2023, the renewables business had inventories with carrying amounts exceeding their net realizable value, which is estimated using indicative market pricing available at the time the estimate was made. As a result, we recognized a loss of $4 million in Cost of materials and other in the Company’s Consolidated Statements of Operations for the year ended December 31, 2023 to reflect the net realizable value of such inventories. No adjustment was necessary for the years ended December 31, 2022 and 2021.