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INVENTORIES (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
At FIFO or average cost (approximates current cost) [Abstract]    
Finished goods $ 1,118 $ 1,114
Work in process 271 213
Raw materials and supplies 554 470
Total inventories 1,943 1,797
Less: LIFO Reserve 318 288
Total inventories $ 1,625 $ 1,509
Inventories valued on the LIFO method 55.00% 60.00%