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Inventories
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consist of the following:
 September 30, 
 2021
December 31, 
 2020
 (in millions)
Finished goods$370 $246 
Raw materials, spare parts and supplies48 41 
Total inventories$418 $287