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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 23,013  
Ending balance 22,279 $ 23,013
Current lease liabilities 216  
Non-current lease liabilities 1,519  
Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,959  
Ending balance 4,722 4,959
Right-of-use assets 15  
Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,206  
Ending balance 8,080 8,206
Right-of-use assets 1,271  
Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,805  
Ending balance 8,487 8,805
Right-of-use assets 254  
Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,043  
Ending balance 990 1,043
Right-of-use assets 526  
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 593 1,016
Non-cash disposals (119) (274)
Acquisitions through business combinations   8,710
Decrease through classified as held for sale, property, plant and equipment   (458)
Net foreign currency exchange differences (744) 213
Ending balance 21,774 22,044
Gross Carrying Amount: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 4,183 4,020
Change in Accounting Policies   21
Additions, net of disposals 173 467
Non-cash disposals 2 (2)
Acquisitions through business combinations   0
Decrease through classified as held for sale, property, plant and equipment   (458)
Net foreign currency exchange differences (291) 135
Ending balance 4,067 4,183
Gross Carrying Amount: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,299 2,485
Change in Accounting Policies   356
Additions, net of disposals 185 122
Non-cash disposals (82) 49
Acquisitions through business combinations   5,283
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences (132) 4
Ending balance 8,270 8,299
Gross Carrying Amount: | Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 8,431 4,681
Change in Accounting Policies   197
Additions, net of disposals 221 419
Non-cash disposals (29) (270)
Acquisitions through business combinations   3,332
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences (307) 72
Ending balance 8,316 8,431
Gross Carrying Amount: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,131 444
Change in Accounting Policies   633
Additions, net of disposals 14 8
Non-cash disposals (10) (51)
Acquisitions through business combinations   95
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences (14) 2
Ending balance 1,121 1,131
Accumulated depreciation:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (2,417) (1,849)
Non-cash disposals 108 26
Decrease through classified as held for sale, property, plant and equipment   194
Net foreign currency exchange differences 95 (29)
Depreciation expense (543) (764)
Disposals 6 5
Ending balance (2,751) (2,417)
Accumulated depreciation: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (594) (613)
Non-cash disposals 0 3
Decrease through classified as held for sale, property, plant and equipment   194
Net foreign currency exchange differences 40 (14)
Depreciation expense (74) (171)
Disposals 1 7
Ending balance (627) (594)
Accumulated depreciation: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (950) (744)
Non-cash disposals 100 (27)
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences 34 (3)
Depreciation expense (215) (178)
Disposals 4 2
Ending balance (1,027) (950)
Accumulated depreciation: | Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (785) (492)
Non-cash disposals 2 50
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences 20 (11)
Depreciation expense (204) (328)
Disposals 1 (4)
Ending balance (966) (785)
Accumulated depreciation: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (88) 0
Non-cash disposals 6 0
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences 1 (1)
Depreciation expense (50) (87)
Disposals 0 0
Ending balance (131) (88)
Accumulated fair value adjustments:    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,386 3,033
Non-cash disposals   (12)
Decrease through classified as held for sale, property, plant and equipment   (416)
Net foreign currency exchange differences (130) 62
Fair value adjustments   719
Ending balance 3,256 3,386
Accumulated fair value adjustments: | Utilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,370 1,401
Non-cash disposals   0
Decrease through classified as held for sale, property, plant and equipment   (416)
Net foreign currency exchange differences (88) 38
Fair value adjustments   347
Ending balance 1,282 1,370
Accumulated fair value adjustments: | Transport    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 857 810
Non-cash disposals   0
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences (20) 2
Fair value adjustments   45
Ending balance 837 857
Accumulated fair value adjustments: | Energy    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,159 822
Non-cash disposals   (12)
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences (22) 22
Fair value adjustments   327
Ending balance 1,137 1,159
Accumulated fair value adjustments: | Data Infrastructure    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Non-cash disposals   0
Decrease through classified as held for sale, property, plant and equipment   0
Net foreign currency exchange differences 0 0
Fair value adjustments   0
Ending balance $ 0 $ 0