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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 8,656 |
Ending balance | 9,937 | $ 8,656
Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 3,555 |
Ending balance | 4,219 | 3,555
Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,627 |
Ending balance | 2,843 | 2,627
Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,474 |
Ending balance | 2,875 | 2,474
Gross Carrying Amount: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 7,637 | 6,552
Additions, net of disposals | 548 | 564
Non-cash disposals | (14) | (28)
Acquisitions through business combinations | 100 | 1,067
Net foreign currency exchange differences | 486 | (518)
Ending balance | 8,757 | 7,637
Gross Carrying Amount: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,895 | 2,945
Additions, net of disposals | 349 | 399
Non-cash disposals | 0 | (31)
Acquisitions through business combinations | 0 | 0
Net foreign currency exchange differences | 227 | (418)
Ending balance | 3,471 | 2,895
Gross Carrying Amount: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,362 | 2,150
Additions, net of disposals | 104 | 76
Non-cash disposals | 0 | 3
Acquisitions through business combinations | 0 | 242
Net foreign currency exchange differences | 191 | (109)
Ending balance | 2,657 | 2,362
Gross Carrying Amount: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,380 | 1,457
Additions, net of disposals | 95 | 89
Non-cash disposals | (14) | 0
Acquisitions through business combinations | 100 | 825
Net foreign currency exchange differences | 68 | 9
Ending balance | 2,629 | 2,380
Accumulated depreciation: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (1,158) | (868)
Disposals | 40 |
Non-cash disposals | 5 | 4
Net foreign currency exchange differences | (85) | 60
Depreciation expense | (382) | (354)
Ending balance | (1,580) | (1,158)
Accumulated depreciation: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (383) | (291)
Disposals | 19 |
Non-cash disposals | 0 | 0
Net foreign currency exchange differences | (28) | 36
Depreciation expense | (118) | (128)
Ending balance | (510) | (383)
Accumulated depreciation: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (517) | (418)
Disposals | 21 |
Non-cash disposals | 0 | 4
Net foreign currency exchange differences | (44) | 24
Depreciation expense | (147) | (127)
Ending balance | (687) | (517)
Accumulated depreciation: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (258) | (159)
Disposals | 0 |
Non-cash disposals | 5 | 0
Net foreign currency exchange differences | (13) | 0
Depreciation expense | (117) | (99)
Ending balance | (383) | (258)
Accumulated fair value adjustments: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,177 | 1,948
Fair value adjustments | 418 | 335
Net foreign currency exchange differences | 165 | (106)
Ending balance | 2,760 | 2,177
Accumulated fair value adjustments: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,043 | 945
Fair value adjustments | 137 | 185
Net foreign currency exchange differences | 78 | (87)
Ending balance | 1,258 | 1,043
Accumulated fair value adjustments: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 782 | 777
Fair value adjustments | 24 | 25
Net foreign currency exchange differences | 67 | (20)
Ending balance | 873 | 782
Accumulated fair value adjustments: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 352 | 226
Fair value adjustments | 257 | 125
Net foreign currency exchange differences | 20 | 1
Ending balance | $ 629 | $ 352

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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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