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INVENTORIES - SUMMARY OF INVENTORY (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]      
Finished goods $ 327   $ 264
Work-in-process 73   68
Raw materials and supplies 132   134
Inventories, net $ 532 $ 1 $ 466