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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 31,584  
Ending balance 28,005 $ 31,584
Current lease liabilities 168  
Non-current lease liabilities 3,293  
Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 10,610  
Ending balance 7,871 10,610
Right-of-use assets 116  
Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,341  
Ending balance 8,111 8,341
Right-of-use assets 983  
Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,330  
Ending balance 7,691 8,330
Right-of-use assets 2,496  
Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,303  
Ending balance 4,332 4,303
Right-of-use assets 111  
Gross Carrying Amount:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 30,900 22,044
Additions, net of disposals 681 1,305
Non-cash disposals (704) (281)
Acquisitions through business combinations 184 7,334
Assets held by subsidiaries disposed during the period (1,493)  
Net foreign currency exchange differences (98) 498
Ending balance 28,665 30,900
Classification of assets as held for sale [member] (805)  
Gross Carrying Amount: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 9,289 8,633
Additions, net of disposals 258 535
Non-cash disposals 16 15
Acquisitions through business combinations 176 0
Assets held by subsidiaries disposed during the period (1,493)  
Net foreign currency exchange differences 25 106
Ending balance 7,466 9,289
Classification of assets as held for sale [member] (805)  
Gross Carrying Amount: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,697 8,309
Additions, net of disposals 212 387
Non-cash disposals (249) (241)
Acquisitions through business combinations 8 0
Assets held by subsidiaries disposed during the period 0  
Net foreign currency exchange differences (51) 242
Ending balance 8,617 8,697
Classification of assets as held for sale [member] 0  
Gross Carrying Amount: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,593 1,131
Additions, net of disposals 150 77
Non-cash disposals (440) (26)
Acquisitions through business combinations   7,334
Net foreign currency exchange differences (158) 77
Ending balance 8,145 8,593
Gross Carrying Amount: | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,321 3,971
Additions, net of disposals 61 306
Non-cash disposals (31) (29)
Acquisitions through business combinations 0 0
Assets held by subsidiaries disposed during the period 0  
Net foreign currency exchange differences 86 73
Ending balance 4,437 4,321
Classification of assets as held for sale [member] 0  
Gross Carrying Amount: | Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisitions through business combinations 0  
Assets held by subsidiaries disposed during the period 0  
Classification of assets as held for sale [member] 0  
Accumulated depreciation:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (3,636) (2,417)
Non-cash disposals 94 147
Assets held by subsidiaries disposed during the period 403  
Net foreign currency exchange differences 7 (135)
Depreciation expense (712) (1,247)
Disposals 9 16
Ending balance (3,575) (3,636)
Classification of assets as held for sale [member] 260  
Accumulated depreciation: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,613) (1,171)
Non-cash disposals 1 0
Assets held by subsidiaries disposed during the period 403  
Net foreign currency exchange differences (13) (35)
Depreciation expense (189) (419)
Disposals (8) (12)
Ending balance (1,143) (1,613)
Classification of assets as held for sale [member] 260  
Accumulated depreciation: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,404) (950)
Non-cash disposals 90 130
Assets held by subsidiaries disposed during the period 0  
Net foreign currency exchange differences 20 (90)
Depreciation expense (241) (498)
Disposals (1) (4)
Ending balance (1,534) (1,404)
Classification of assets as held for sale [member] 0  
Accumulated depreciation: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (263) (88)
Non-cash disposals 2 17
Net foreign currency exchange differences 6 (3)
Depreciation expense (199) (189)
Disposals 0 0
Ending balance (454) (263)
Accumulated depreciation: | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (356) (208)
Non-cash disposals 1 0
Assets held by subsidiaries disposed during the period 0  
Net foreign currency exchange differences (6) (7)
Depreciation expense (83) (141)
Disposals 0 0
Ending balance (444) (356)
Classification of assets as held for sale [member] 0  
Accumulated depreciation: | Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Assets held by subsidiaries disposed during the period 0  
Classification of assets as held for sale [member] 0  
Accumulated fair value adjustments:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,320 3,386
Assets held by subsidiaries disposed during the period (889)  
Net foreign currency exchange differences (3) 148
Fair value adjustments   786
Ending balance 2,915 4,320
Classification of assets as held for sale [member] (513)  
Accumulated fair value adjustments: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,934 2,212
Assets held by subsidiaries disposed during the period (889)  
Net foreign currency exchange differences 16 70
Fair value adjustments   652
Ending balance 1,548 2,934
Classification of assets as held for sale [member] (513)  
Accumulated fair value adjustments: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,048 857
Assets held by subsidiaries disposed during the period 0  
Net foreign currency exchange differences (20) 78
Fair value adjustments   113
Ending balance 1,028 1,048
Classification of assets as held for sale [member] 0  
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
Accumulated fair value adjustments: | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 338 317
Assets held by subsidiaries disposed during the period 0  
Net foreign currency exchange differences 1 0
Fair value adjustments   21
Ending balance 339 $ 338
Classification of assets as held for sale [member] 0  
Accumulated fair value adjustments: | Data    
Reconciliation of changes in property, plant and equipment [abstract]    
Assets held by subsidiaries disposed during the period 0  
Classification of assets as held for sale [member] $ 0