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INVENTORIES
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
 
December 31,
(Dollars in millions)
2018
 
2017
 
 
 
 
Finished goods
$
1,143

 
$
1,114

Work in process
262

 
213

Raw materials and supplies
515

 
470

Total inventories at FIFO or average cost
1,920

 
1,797

Less: LIFO reserve
337

 
288

Total inventories
$
1,583

 
$
1,509



Inventories valued on the LIFO method were approximately 55 percent of total inventories at both December 31, 2018 and 2017.