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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 12,814  
Ending balance 23,013 $ 12,814
Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,808  
Ending balance 4,959 4,808
Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,551  
Ending balance 8,206 2,551
Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 5,011  
Ending balance 8,805 5,011
Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 444  
Ending balance 1,043 444
Gross Carrying Amount:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 11,630 8,757
Additions, net of disposals 1,016 662
Non-cash (disposals) additions (274) (17)
Change in Accounting Policies 1,207  
Acquisitions through business combinations 8,710 2,945
Assets reclassified as held for sale (458)  
Net foreign currency exchange differences 213 (717)
Ending balance 22,044 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 467 441
Non-cash (disposals) additions (2) (19)
Change in Accounting Policies 21  
Acquisitions through business combinations 0 394
Assets reclassified as held for sale (458)  
Net foreign currency exchange differences 135 (267)
Ending balance 4,183 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 122 77
Non-cash (disposals) additions 49 (4)
Change in Accounting Policies 356  
Acquisitions through business combinations 5,283 0
Assets reclassified as held for sale 0  
Net foreign currency exchange differences 4 (245)
Ending balance 8,299 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 419 140
Non-cash (disposals) additions (270) 6
Change in Accounting Policies 197  
Acquisitions through business combinations 3,332 2,111
Assets reclassified as held for sale 0  
Net foreign currency exchange differences 72 (205)
Ending balance 8,431 4,681
Gross Carrying Amount: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 444 0
Additions, net of disposals 8 4
Non-cash (disposals) additions (51) 0
Change in Accounting Policies 633  
Acquisitions through business combinations 95 440
Assets reclassified as held for sale 0  
Net foreign currency exchange differences 2 0
Ending balance 1,131 444
Accumulated depreciation:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,849) (1,580)
Non-cash (disposals) additions 26 (3)
Depreciation expense (764) (430)
Disposals 5 37
Assets reclassified as held for sale 194  
Net foreign currency exchange differences (29) 127
Ending balance (2,417) (1,849)
Accumulated depreciation: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (613) (510)
Non-cash (disposals) additions 3 (2)
Depreciation expense (171) (149)
Disposals 7 7
Assets reclassified as held for sale 194  
Net foreign currency exchange differences (14) 41
Ending balance (594) (613)
Accumulated depreciation: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (744) (687)
Non-cash (disposals) additions (27) 0
Depreciation expense (178) (147)
Disposals 2 22
Assets reclassified as held for sale 0  
Net foreign currency exchange differences (3) 68
Ending balance (950) (744)
Accumulated depreciation: | Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (492) (383)
Non-cash (disposals) additions 50 (1)
Depreciation expense (328) (134)
Disposals (4) 8
Assets reclassified as held for sale 0  
Net foreign currency exchange differences (11) 18
Ending balance (785) (492)
Accumulated depreciation: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Non-cash (disposals) additions 0 0
Depreciation expense (87) 0
Disposals 0 0
Assets reclassified as held for sale 0  
Net foreign currency exchange differences (1) 0
Ending balance (88) 0
Accumulated fair value adjustments:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,033 2,760
Assets reclassified as held for sale (416)  
Fair value adjustments 719 462
Net foreign currency exchange differences 62 (189)
Ending balance 3,386 3,033
Accumulated fair value adjustments: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,401 1,258
Assets reclassified as held for sale (416)  
Fair value adjustments 347 220
Net foreign currency exchange differences 38 (77)
Ending balance 1,370 1,401
Accumulated fair value adjustments: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 810 873
Assets reclassified as held for sale 0  
Fair value adjustments 45 18
Net foreign currency exchange differences 2 (81)
Ending balance 857 810
Accumulated fair value adjustments: | Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 822 629
Assets reclassified as held for sale 0  
Fair value adjustments 327 224
Net foreign currency exchange differences 22 (31)
Ending balance 1,159 822
Accumulated fair value adjustments: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Assets reclassified as held for sale 0  
Fair value adjustments 0 0
Net foreign currency exchange differences 0 0
Ending balance $ 0 $ 0