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INVENTORIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Jun. 30, 2021
At FIFO or average cost (approximates current cost) [Abstract]    
Finished goods $ 891 $ 945
Work in process 203 240
Raw materials and supplies 511 580
Total inventories at FIFO or average cost 1,605 1,765
Less: LIFO reserve 226 264
Total inventories $ 1,379 $ 1,501
Inventories valued on the LIFO method 50.00% 45.00%
LIFO decrement $ 13