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PROPERTY, PLANT AND EQUIPMENT - Schedule of Infrastructure Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period $ 89,264        
Changes in basis of accounting     $ 3,300 $ 2,600  
Balance, end of period 100,009 $ 89,264      
Property, plant and equipment 89,264 89,264 100,009 89,264  
Right-of-use assets     3,300 2,600  
Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 77,433        
Balance, end of period 88,071 77,433      
Property, plant and equipment 77,433 77,433 88,071 77,433  
Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 24,965        
Balance, end of period 28,384 24,965      
Property, plant and equipment 24,965 24,965 28,384 24,965  
Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (13,134)        
Balance, end of period (16,446) (13,134)      
Property, plant and equipment (13,134) (13,134) (16,446) (13,134)  
Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 23,772        
Balance, end of period 32,167 23,772      
Property, plant and equipment 23,772 23,772 32,167 23,772  
Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 22,454 12,059      
Additions, net of disposals and assets reclassified as held for sale 1,008 273      
Acquisitions through business combinations 7,334 8,710      
Foreign currency translation 416 205      
Balance, end of period 31,212 22,454      
Property, plant and equipment 22,454 12,059 31,212 22,454 $ 12,059
Additions, net of disposals and assets reclassified as held for sale 1,008 273      
Acquisitions through business combinations, property, plant and equipment 7,334 8,710      
Foreign currency translation 416 205      
Infrastructure | Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 3,777 3,480      
Dispositions and assets reclassified as held for sale 0 (453)      
Fair value changes 792 715      
Foreign currency translation 57 35      
Balance, end of period 4,626 3,777      
Property, plant and equipment 3,777 3,777 4,626 3,777 3,480
Foreign currency translation 57 35      
Disposals, property, plant and equipment 0 453      
Fair value changes 792 715      
Infrastructure | Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (2,459) (1,889)      
Depreciation expenses (1,257) (774)      
Dispositions and assets reclassified as held for sale 170 232      
Foreign currency translation (125) (28)      
Balance, end of period (3,671) (2,459)      
Property, plant and equipment (2,459) (2,459) (3,671) (2,459) (1,889)
Foreign currency translation (125) (28)      
Disposals, property, plant and equipment (170) (232)      
Depreciation, property, plant and equipment 1,257 774      
Utilities [Member] | Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 9,669        
Balance, end of period 10,610 9,669      
Property, plant and equipment 9,669 9,669 10,610 9,669  
Utilities [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 8,654 6,248      
Additions, net of disposals and assets reclassified as held for sale 550 34      
Acquisitions through business combinations 0 2,135      
Foreign currency translation 102 127      
Balance, end of period 9,306 8,654      
Property, plant and equipment 8,654 8,654 9,306 8,654 6,248
Additions, net of disposals and assets reclassified as held for sale 550 34      
Acquisitions through business combinations, property, plant and equipment 0 2,135      
Foreign currency translation 102 127      
Utilities [Member] | Infrastructure | Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 2,187 2,002      
Dispositions and assets reclassified as held for sale 0 (416)      
Fair value changes 652 572      
Foreign currency translation 78 29      
Balance, end of period 2,917 2,187      
Property, plant and equipment 2,187 2,187 2,917 2,187 2,002
Foreign currency translation 78 29      
Disposals, property, plant and equipment 0 416      
Fair value changes 652 572      
Utilities [Member] | Infrastructure | Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (1,172) (985)      
Depreciation expenses (419) (415)      
Dispositions and assets reclassified as held for sale 12 247      
Foreign currency translation (34) (19)      
Balance, end of period (1,613) (1,172)      
Property, plant and equipment (1,613) (985) (1,613) (1,172) (985)
Foreign currency translation (34) (19)      
Disposals, property, plant and equipment (12) (247)      
Depreciation, property, plant and equipment 419 415      
Transport | Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 8,216        
Balance, end of period 8,341 8,216      
Property, plant and equipment 8,216 8,216 8,341 8,216  
Transport | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 8,309 2,495      
Additions, net of disposals and assets reclassified as held for sale 146 171      
Acquisitions through business combinations 0 5,283      
Foreign currency translation 243 4      
Balance, end of period 8,698 8,309      
Property, plant and equipment 8,698 2,495 8,698 8,309 2,495
Additions, net of disposals and assets reclassified as held for sale 146 171      
Acquisitions through business combinations, property, plant and equipment 0 5,283      
Foreign currency translation 243 4      
Transport | Infrastructure | Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 857 810      
Dispositions and assets reclassified as held for sale 0 0      
Fair value changes 113 45      
Foreign currency translation 77 2      
Balance, end of period 1,047 857      
Property, plant and equipment 1,047 810 1,047 857 810
Foreign currency translation 77 2      
Disposals, property, plant and equipment 0 0      
Fair value changes 113 45      
Transport | Infrastructure | Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (950) (744)      
Depreciation expenses (498) (178)      
Dispositions and assets reclassified as held for sale 134 (25)      
Foreign currency translation (90) (3)      
Balance, end of period (1,404) (950)      
Property, plant and equipment (1,404) (744) (1,404) (950) (744)
Foreign currency translation (90) (3)      
Disposals, property, plant and equipment (134) 25      
Depreciation, property, plant and equipment 498 178      
Energy [Member] | Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 4,080        
Balance, end of period 4,303 4,080      
Property, plant and equipment 4,080 4,080 4,303 4,080  
Energy [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 3,971 2,443      
Additions, net of disposals and assets reclassified as held for sale 277 136      
Acquisitions through business combinations 0 1,197      
Foreign currency translation 73 87      
Balance, end of period 4,321 3,971      
Property, plant and equipment 4,321 2,443 4,321 3,971 2,443
Additions, net of disposals and assets reclassified as held for sale 277 136      
Acquisitions through business combinations, property, plant and equipment 0 1,197      
Foreign currency translation 73 87      
Energy [Member] | Infrastructure | Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 317 221      
Dispositions and assets reclassified as held for sale 0 0      
Fair value changes 21 92      
Foreign currency translation 0 4      
Balance, end of period 338 317      
Property, plant and equipment 338 221 338 317 221
Foreign currency translation 0 4      
Disposals, property, plant and equipment 0 0      
Fair value changes 21 92      
Energy [Member] | Infrastructure | Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (208) (120)      
Depreciation expenses (141) (84)      
Dispositions and assets reclassified as held for sale 0 3      
Foreign currency translation (7) (7)      
Balance, end of period (356) (208)      
Property, plant and equipment (356) (120) (356) (208) (120)
Foreign currency translation (7) (7)      
Disposals, property, plant and equipment 0 (3)      
Depreciation, property, plant and equipment 141 84      
Data Infrastructure [Member] | Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 1,043        
Balance, end of period 8,330 1,043      
Property, plant and equipment 1,043 1,043 8,330 1,043  
Data Infrastructure [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 1,131 444      
Additions, net of disposals and assets reclassified as held for sale 51 (43)      
Acquisitions through business combinations 7,334 95      
Foreign currency translation 77 2      
Balance, end of period 8,593 1,131      
Property, plant and equipment 8,593 444 8,593 1,131 444
Additions, net of disposals and assets reclassified as held for sale 51 (43)      
Acquisitions through business combinations, property, plant and equipment 7,334 95      
Foreign currency translation 77 2      
Data Infrastructure [Member] | Infrastructure | Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 0 0      
Dispositions and assets reclassified as held for sale 0 0      
Fair value changes 0 0      
Foreign currency translation 0 0      
Balance, end of period 0 0      
Property, plant and equipment 0 0 0 0 0
Foreign currency translation 0 0      
Disposals, property, plant and equipment 0 0      
Fair value changes 0 0      
Data Infrastructure [Member] | Infrastructure | Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (88) 0      
Depreciation expenses (189) (87)      
Dispositions and assets reclassified as held for sale 17 0      
Foreign currency translation (3) (1)      
Balance, end of period (263) (88)      
Property, plant and equipment (263) 0 (263) (88) 0
Foreign currency translation (3) (1)      
Disposals, property, plant and equipment (17) 0      
Depreciation, property, plant and equipment 189 87      
Sustainable Resources [Member] | Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 764        
Balance, end of period 583 764      
Property, plant and equipment 764 764 583 764  
Sustainable Resources [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 389 429      
Additions, net of disposals and assets reclassified as held for sale (16) (25)      
Acquisitions through business combinations 0 0      
Foreign currency translation (79) (15)      
Balance, end of period 294 389      
Property, plant and equipment 389 389 294 389 429
Additions, net of disposals and assets reclassified as held for sale (16) (25)      
Acquisitions through business combinations, property, plant and equipment 0 0      
Foreign currency translation (79) (15)      
Sustainable Resources [Member] | Infrastructure | Accumulated fair value changes          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period 416 447      
Dispositions and assets reclassified as held for sale 0 (37)      
Fair value changes 6 6      
Foreign currency translation (98) 0      
Balance, end of period 324 416      
Property, plant and equipment 324 447 324 416 447
Foreign currency translation (98) 0      
Disposals, property, plant and equipment 0 37      
Fair value changes 6 6      
Sustainable Resources [Member] | Infrastructure | Accumulated depreciation and amortisation          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period (41) (40)      
Depreciation expenses (10) (10)      
Dispositions and assets reclassified as held for sale 7 7      
Foreign currency translation 9 2      
Balance, end of period (35) (41)      
Property, plant and equipment (35) (40) (35) (41) (40)
Foreign currency translation 9 2      
Disposals, property, plant and equipment (7) (7)      
Depreciation, property, plant and equipment $ 10 $ 10      
Property, plant and equipment [member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting     6,700 5,400  
Right-of-use assets     6,700 5,400  
Property, plant and equipment [member] | Infrastructure          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting     4,100 2,200  
Right-of-use assets     $ 4,100 2,200  
Property, plant and equipment [member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting       0 1,207
Right-of-use assets       0 1,207
Property, plant and equipment [member] | Utilities [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting       0 110
Right-of-use assets       0 110
Property, plant and equipment [member] | Transport | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting       0 356
Right-of-use assets       0 356
Property, plant and equipment [member] | Energy [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting       0 108
Right-of-use assets       0 108
Property, plant and equipment [member] | Data Infrastructure [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting       0 633
Right-of-use assets       0 633
Property, plant and equipment [member] | Sustainable Resources [Member] | Infrastructure | Costs          
Reconciliation of changes in property, plant and equipment [abstract]          
Changes in basis of accounting       0 0
Right-of-use assets       $ 0 $ 0