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INVENTORY (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Natural gas inventory | $ 84,000,000 | $ 82,000,000 |
Raw materials and consumables | 24,000,000 | 19,000,000 |
Carrying amount of inventories | 108,000,000 | 101,000,000 |
Cost of inventories recognised as expense during period | 418,000,000 | 154,000,000 | $ 0
Inventory impairment | $ 0 | $ 0 | $ 0

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- Definition A classification of current inventory representing the amount of a naturally occurring hydrocarbon gas mixture. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_37&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_37&doctype=Standard -URIDate 2017-03-09 + Details
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