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INVENTORIES (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 209 $ 264
Work in process 33 45
Raw materials 40 45
Supplies 91 85
Total 373 439
Adjustment of inventories to a LIFO basis (99) (135)
Total inventories $ 274 $ 304