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INVENTORIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Sep. 30, 2021
At FIFO or average cost (approximates current cost) [Abstract]    
Finished goods $ 891 $ 1,046
Work in process 203 258
Raw materials and supplies 511 644
Total inventories at FIFO or average cost 1,605 1,948
Less: LIFO reserve 226 318
Total inventories $ 1,379 $ 1,630
Inventories valued on the LIFO method 50.00% 50.00%
LIFO decrement $ 13