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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER    
Materials and supplies $ 58 $ 64
Finished goods 3 3
Total $ 61 $ 67