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Inventories
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
(4) Inventories

Inventories consisted of the following:
(in millions)September 30, 2020December 31, 2019
Finished goods$110 $177 
Raw materials73 112 
In-process inventories17 18 
Parts, supplies and other66 66 
Total inventories$266 $373 
As of March 31, 2020, the carrying amounts of the Petroleum Segment’s inventories exceeded their net realizable value (market value) by $58 million resulting in the recognition of a lower of cost or net realizable value adjustment. The $58 million loss represents the difference between the carrying value of the Petroleum Segment’s inventories accounted for using the first-in-first-out method and selling prices for refined products subsequent to March 31, 2020. No adjustment was necessary as of September 30, 2020, June 30, 2020, or December 31, 2019.