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INVENTORY (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventories [Abstract] |
Disclosure of inventories |
US$ MILLIONS |  | 2018 |  | 2017
Current: |  |  |  |
Natural gas inventory |  | $ | 94 |  |  | $ | 84 |
Raw materials and other |  | 47 |  |  | 24 |
Carrying amount of inventories |  | $ | 141 |  |  | $ | 108 |

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