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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 23,013  
Ending balance 31,584 $ 23,013
Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 9,674  
Ending balance 10,610 9,674
Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,216  
Ending balance 8,341 8,216
Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,080  
Ending balance 4,303 4,080
Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,043  
Ending balance 8,330 1,043
Gross Carrying Amount:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 22,044 11,630
Change in Accounting Policies   1,207
Additions, net of disposals 1,305 1,016
Non-cash (disposals) additions (281) (274)
Acquisitions through business combinations 7,334 8,710
Assets reclassified as held for sale   (458)
Net foreign currency exchange differences 498 213
Ending balance 30,900 22,044
Gross Carrying Amount: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,633 6,248
Change in Accounting Policies   110
Additions, net of disposals 535 770
Non-cash (disposals) additions 15 (295)
Acquisitions through business combinations 0 2,135
Assets reclassified as held for sale   (455)
Net foreign currency exchange differences 106 120
Ending balance 9,289 8,633
Gross Carrying Amount: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,309 2,495
Change in Accounting Policies   356
Additions, net of disposals 387 122
Non-cash (disposals) additions (241) 49
Acquisitions through business combinations 0 5,283
Assets reclassified as held for sale   0
Net foreign currency exchange differences 242 4
Ending balance 8,697 8,309
Gross Carrying Amount: | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,971 2,443
Change in Accounting Policies   108
Additions, net of disposals 306 116
Non-cash (disposals) additions (29) 23
Acquisitions through business combinations 0 1,197
Assets reclassified as held for sale   (3)
Net foreign currency exchange differences 73 87
Ending balance 4,321 3,971
Gross Carrying Amount: | Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,131 444
Change in Accounting Policies   633
Additions, net of disposals 77 8
Non-cash (disposals) additions (26) (51)
Acquisitions through business combinations 7,334 95
Assets reclassified as held for sale   0
Net foreign currency exchange differences 77 2
Ending balance 8,593 1,131
Accumulated depreciation:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (2,417) (1,849)
Non-cash (disposals) additions 147 26
Assets reclassified as held for sale   194
Net foreign currency exchange differences (135) (29)
Depreciation expense (1,247) (764)
Disposals 16 5
Ending balance (3,636) (2,417)
Accumulated depreciation: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,171) (985)
Non-cash (disposals) additions 0 50
Assets reclassified as held for sale   194
Net foreign currency exchange differences (35) (18)
Depreciation expense (419) (415)
Disposals 12 3
Ending balance (1,613) (1,171)
Accumulated depreciation: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (950) (744)
Non-cash (disposals) additions 130 (27)
Assets reclassified as held for sale   0
Net foreign currency exchange differences (90) (3)
Depreciation expense (498) (178)
Disposals 4 2
Ending balance (1,404) (950)
Accumulated depreciation: | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (208) (120)
Non-cash (disposals) additions 0 3
Assets reclassified as held for sale   0
Net foreign currency exchange differences (7) (7)
Depreciation expense (141) (84)
Disposals 0 0
Ending balance (356) (208)
Accumulated depreciation: | Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (88) 0
Non-cash (disposals) additions 17 0
Assets reclassified as held for sale   0
Net foreign currency exchange differences (3) (1)
Depreciation expense (189) (87)
Disposals 0 0
Ending balance (263) (88)
Accumulated fair value adjustments:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,386 3,033
Non-cash (disposals) additions   (12)
Assets reclassified as held for sale   (416)
Net foreign currency exchange differences 148 62
Fair value adjustments 786 719
Ending balance 4,320 3,386
Accumulated fair value adjustments: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,212 2,002
Non-cash (disposals) additions   0
Assets reclassified as held for sale   (416)
Net foreign currency exchange differences 70 44
Fair value adjustments 652 582
Ending balance 2,934 2,212
Accumulated fair value adjustments: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 857 810
Non-cash (disposals) additions   0
Assets reclassified as held for sale   0
Net foreign currency exchange differences 78 2
Fair value adjustments 113 45
Ending balance 1,048 857
Accumulated fair value adjustments: | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 317 221
Non-cash (disposals) additions   (12)
Assets reclassified as held for sale   0
Net foreign currency exchange differences 0 16
Fair value adjustments 21 92
Ending balance 338 317
Accumulated fair value adjustments: | Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Non-cash (disposals) additions   0
Assets reclassified as held for sale   0
Net foreign currency exchange differences 0 0
Fair value adjustments 0 0
Ending balance $ 0 $ 0