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INVENTORIES (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Inventory Disclosure [Abstract] |  |
Materials and supplies | $ 58 | $ 64
Finished goods | 2 | 3
Total | 60 | $ 67
Inventory | $ 7 |

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