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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 12,814 |
Ending balance | 16,337 | $ 12,814
Current lease liabilities | 111 |
Non-current lease liabilities | 1,127 |
Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,808 |
Ending balance | 4,946 | 4,808
Right-of-use assets | 21 |
Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,551 |
Ending balance | 2,871 | 2,551
Right-of-use assets | 348 |
Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 5,011 |
Ending balance | 7,509 | 5,011
Right-of-use assets | 245 |
Data Infrastructure |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 444 |
Ending balance | 1,011 | 444
Right-of-use assets | 582 |
Gross Carrying Amount: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 11,630 | 8,757
Additions, net of disposals | 452 | 662
Non-cash disposals | (3) | (17)
Acquisitions through business combinations | 2,134 | 2,945
Net foreign currency exchange differences | 108 | (717)
Change in Accounting Policies | 1,207 |
Ending balance | 15,528 | 11,630
Gross Carrying Amount: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,020 | 3,471
Additions, net of disposals | 204 | 441
Non-cash disposals | (1) | (19)
Acquisitions through business combinations | 0 | 394
Net foreign currency exchange differences | (7) | (267)
Change in Accounting Policies | 21 |
Ending balance | 4,237 | 4,020
Gross Carrying Amount: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 2,485 | 2,657
Additions, net of disposals | 60 | 77
Non-cash disposals | 6 | (4)
Acquisitions through business combinations | 0 | 0
Net foreign currency exchange differences | (15) | (245)
Change in Accounting Policies | 356 |
Ending balance | 2,892 | 2,485
Gross Carrying Amount: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 4,681 | 2,629
Additions, net of disposals | 185 | 140
Non-cash disposals | 13 | 6
Acquisitions through business combinations | 2,134 | 2,111
Net foreign currency exchange differences | 131 | (205)
Change in Accounting Policies | 197 |
Ending balance | 7,341 | 4,681
Gross Carrying Amount: | Data Infrastructure |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 444 | 0
Additions, net of disposals | 3 | 4
Non-cash disposals | (21) | 0
Acquisitions through business combinations | 0 | 440
Net foreign currency exchange differences | (1) | 0
Change in Accounting Policies | 633 |
Ending balance | 1,058 | 444
Accumulated depreciation: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (1,849) | (1,580)
Non-cash disposals | 3 | (3)
Net foreign currency exchange differences | (7) | 127
Depreciation expense | (387) | (430)
Disposals | 4 | 37
Ending balance | (2,236) | (1,849)
Accumulated depreciation: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (613) | (510)
Non-cash disposals | (1) | (2)
Net foreign currency exchange differences | 2 | 41
Depreciation expense | (86) | (149)
Disposals | 4 | (7)
Ending balance | (694) | (613)
Accumulated depreciation: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (744) | (687)
Non-cash disposals | 1 | 0
Net foreign currency exchange differences | 6 | 68
Depreciation expense | (90) | (147)
Disposals | 0 | 22
Ending balance | (827) | (744)
Accumulated depreciation: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (492) | (383)
Non-cash disposals | 3 | (1)
Net foreign currency exchange differences | (15) | 18
Depreciation expense | (164) | (134)
Disposals | 0 | 8
Ending balance | (668) | (492)
Accumulated depreciation: | Data Infrastructure |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Non-cash disposals | 0 | 0
Net foreign currency exchange differences | 0 | 0
Depreciation expense | (47) | 0
Disposals | 0 | 0
Ending balance | (47) | 0
Accumulated fair value adjustments: |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 3,033 | 2,760
Net foreign currency exchange differences | 12 | (189)
Fair value adjustments |  | 462
Ending balance | 3,045 | 3,033
Accumulated fair value adjustments: | Utilities |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,401 | 1,258
Net foreign currency exchange differences | 2 | (77)
Fair value adjustments |  | 220
Ending balance | 1,403 | 1,401
Accumulated fair value adjustments: | Transport |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 810 | 873
Net foreign currency exchange differences | (4) | (81)
Fair value adjustments |  | 18
Ending balance | 806 | 810
Accumulated fair value adjustments: | Energy |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 822 | 629
Net foreign currency exchange differences | 14 | (31)
Fair value adjustments |  | 224
Ending balance | 836 | 822
Accumulated fair value adjustments: | Data Infrastructure |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Net foreign currency exchange differences | 0 | 0
Fair value adjustments |  | 0
Ending balance | $ 0 | $ 0

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