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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 |

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