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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 9,937 |
Ending balance | 12,814 | $ 9,937
Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,219 |
Ending balance | 4,808 | 4,219
Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,843 |
Ending balance | 2,551 | 2,843
Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,875 |
Ending balance | 5,011 | 2,875
Data Infrastructure [Member] |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 |
Ending balance | 444 | 0
Gross Carrying Amount: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 8,757 | 7,637
Additions, net of disposals | 662 | 548
Non-cash disposals | (17) | (14)
Acquisitions through business combinations | 2,945 | 100
Net foreign currency exchange differences | (717) | 486
Ending balance | 11,630 | 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 | 441 | 349
Non-cash disposals | (19) | 0
Acquisitions through business combinations | 394 | 0
Net foreign currency exchange differences | (267) | 227
Ending balance | 4,020 | 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 | 77 | 104
Non-cash disposals | (4) | 0
Acquisitions through business combinations | 0 | 0
Net foreign currency exchange differences | (245) | 191
Ending balance | 2,485 | 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 | 140 | 95
Non-cash disposals | 6 | (14)
Acquisitions through business combinations | 2,111 | 100
Net foreign currency exchange differences | (205) | 68
Ending balance | 4,681 | 2,629
Gross Carrying Amount: | Data Infrastructure [Member] |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Additions, net of disposals | 4 | 0
Non-cash disposals | 0 | 0
Acquisitions through business combinations | 440 | 0
Net foreign currency exchange differences | 0 | 0
Ending balance | 444 | 0
Accumulated depreciation: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (1,580) | (1,158)
Disposals | 37 | 5
Non-cash disposals | (3) | 40
Net foreign currency exchange differences | 127 | (85)
Depreciation expense | (430) | (382)
Ending balance | (1,849) | (1,580)
Accumulated depreciation: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (510) | (383)
Disposals | 7 | 0
Non-cash disposals | (2) | 19
Net foreign currency exchange differences | 41 | (28)
Depreciation expense | (149) | (118)
Ending balance | (613) | (510)
Accumulated depreciation: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (687) | (517)
Disposals | 22 | 0
Non-cash disposals | 0 | 21
Net foreign currency exchange differences | 68 | (44)
Depreciation expense | (147) | (147)
Ending balance | (744) | (687)
Accumulated depreciation: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (383) | (258)
Disposals | 8 | 5
Non-cash disposals | (1) | 0
Net foreign currency exchange differences | 18 | (13)
Depreciation expense | (134) | (117)
Ending balance | (492) | (383)
Accumulated depreciation: | Data Infrastructure [Member] |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Disposals | 0 | 0
Non-cash disposals | 0 | 0
Net foreign currency exchange differences | 0 | 0
Depreciation expense | 0 | 0
Ending balance | 0 | 0
Accumulated fair value adjustments: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,760 | 2,177
Fair value adjustments | 462 | 418
Net foreign currency exchange differences | (189) | 165
Ending balance | 3,033 | 2,760
Accumulated fair value adjustments: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,258 | 1,043
Fair value adjustments | 220 | 137
Net foreign currency exchange differences | (77) | 78
Ending balance | 1,401 | 1,258
Accumulated fair value adjustments: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 873 | 782
Fair value adjustments | 18 | 24
Net foreign currency exchange differences | (81) | 67
Ending balance | 810 | 873
Accumulated fair value adjustments: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 629 | 352
Fair value adjustments | 224 | 257
Net foreign currency exchange differences | (31) | 20
Ending balance | 822 | 629
Accumulated fair value adjustments: | Data Infrastructure [Member] |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Fair value adjustments | 0 | 0
Net foreign currency exchange differences | 0 | 0
Ending balance | $ 0 | $ 0

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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 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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