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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