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INVENTORY (Tables) | 12 Months Ended
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Dec. 31, 2017
Inventories [Abstract] |
Disclosure of current inventories |
US$ MILLIONS |  | 2017 |  | 2016
Current: |  |  |  |
Natural gas inventory |  | $ | 84 |  |  | $ | 82 |
Raw materials and consumables |  | 24 |  |  | 19 |
Carrying amount of inventories |  | $ | 108 |  |  | $ | 101 |

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