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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