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INVENTORIES
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
 
March 31,
 
December 31,
(Dollars in millions)
2019
 
2018
Finished goods
$
1,201

 
$
1,143

Work in process
260

 
262

Raw materials and supplies
572

 
515

Total inventories at FIFO or average cost
2,033

 
1,920

Less: LIFO reserve
329

 
337

Total inventories
$
1,704

 
$
1,583



Inventories valued on the last-in, first-out ("LIFO") method were approximately 55 percent of total inventories at both March 31, 2019 and December 31, 2018.