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INVENTORY (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |
Natural gas inventory | $ 94 | $ 84 |
Raw materials and other | 47 | 24 |
Carrying amount of inventories | 141 | 108 |
Cost of inventories recognised as expense during period | 502 | 418 | $ 154
Inventory impairment | $ 0 | $ 0 | $ 0

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