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PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Utilities |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, revalued assets, at cost | $ 2,961 | $ 2,512
Transport |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, revalued assets, at cost | 1,970 | 1,845
Energy |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, revalued assets, at cost | 2,246 | 2,122
Accumulated fair value adjustments |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 418 | 335
Accumulated fair value adjustments | Utilities |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 137 | 185
Accumulated fair value adjustments | Transport |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 24 | 25
Accumulated fair value adjustments | Energy |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | $ 257 | $ 125

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of property, plant and equipment that would have been recognised had the revalued assets been carried under the cost model. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 77 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_77_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from revaluations to fair value. [Refer: Property, plant and equipment; Revaluation surplus] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 77 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_77_f&doctype=Standard -URIDate 2017-03-09 + Details
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