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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