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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 9,937 |
Ending balance | 10,221 | $ 9,937
Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,219 |
Ending balance | 4,763 | 4,219
Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,843 |
Ending balance | 2,652 | 2,843
Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,875 |
Ending balance | 2,806 | 2,875
Gross Carrying Amount: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 8,757 | 7,637
Additions, net of disposals | 306 | 548
Non-cash disposals | (44) | (14)
Acquisitions through business combinations | 487 | 100
Net foreign currency exchange differences | (264) | 486
Ending balance | 9,242 | 8,757
Gross Carrying Amount: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 3,471 | 2,895
Additions, net of disposals | 230 | 349
Non-cash disposals | (23) | 0
Acquisitions through business combinations | 487 | 0
Net foreign currency exchange differences | (86) | 227
Ending balance | 4,079 | 3,471
Gross Carrying Amount: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,657 | 2,362
Additions, net of disposals | 28 | 104
Non-cash disposals | (21) | 0
Acquisitions through business combinations | 0 | 0
Net foreign currency exchange differences | (130) | 191
Ending balance | 2,534 | 2,657
Gross Carrying Amount: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,629 | 2,380
Additions, net of disposals | 48 | 95
Non-cash disposals | 0 | (14)
Acquisitions through business combinations | 0 | 100
Net foreign currency exchange differences | (48) | 68
Ending balance | 2,629 | 2,629
Accumulated depreciation: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (1,580) | (1,158)
Non-cash disposals |  | 40
Net foreign currency exchange differences | 49 | (85)
Disposals | 15 | 5
Depreciation expense | (208) | (382)
Ending balance | (1,724) | (1,580)
Accumulated depreciation: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (510) | (383)
Non-cash disposals |  | 19
Net foreign currency exchange differences | 6 | (28)
Disposals | 2 | 0
Depreciation expense | (70) | (118)
Ending balance | (572) | (510)
Accumulated depreciation: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (687) | (517)
Non-cash disposals |  | 21
Net foreign currency exchange differences | 35 | (44)
Disposals | 13 | 0
Depreciation expense | (73) | (147)
Ending balance | (712) | (687)
Accumulated depreciation: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (383) | (258)
Non-cash disposals |  | 0
Net foreign currency exchange differences | 8 | (13)
Disposals | 0 | 5
Depreciation expense | (65) | (117)
Ending balance | (440) | (383)
Accumulated fair value adjustments: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,760 | 2,177
Net foreign currency exchange differences | (57) | 165
Fair value adjustments |  | 418
Ending balance | 2,703 | 2,760
Accumulated fair value adjustments: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,258 | 1,043
Net foreign currency exchange differences | (2) | 78
Fair value adjustments |  | 137
Ending balance | 1,256 | 1,258
Accumulated fair value adjustments: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 873 | 782
Net foreign currency exchange differences | (43) | 67
Fair value adjustments |  | 24
Ending balance | 830 | 873
Accumulated fair value adjustments: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 629 | 352
Net foreign currency exchange differences | (12) | 20
Fair value adjustments |  | 257
Ending balance | $ 617 | $ 629

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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