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INVENTORIES
 9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
The following table provides a breakdown of inventories:

InventoriesSep 30, 2021Dec 31, 2020
In millions
Finished goods$212 $157 
Work in process34 23 
Raw materials46 38 
Supplies78 98 
Total$370 $316 
Adjustment of inventories to a LIFO basis(158)(93)
Total inventories$212 $223 
A reduction of certain inventories resulted in the liquidation of related LIFO inventory layers, which increased pretax income $13 million and $16 million for the three and nine months ended September 30, 2021, respectively, and had an immaterial impact on pretax income for the three and nine months ended September 30, 2020.