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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

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