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GOODWILL - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
yr
Dec. 31, 2019
USD ($)
yr
Dec. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 14,714 $ 14,550   $ 8,815
Impairment loss recognised in profit or loss, goodwill 3 453    
Acquisitions through business combinations $ 145 $ 6,125    
Actuarial assumption of discount rates 2.00% 3.00%    
Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal Year | yr 7      
Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal Year | yr 21      
Utilities [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal Year | yr 10      
Utilities [Member] | Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal Year | yr   10    
Utilities [Member] | Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal Year | yr   20    
North America        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal Year | yr 2,041 2,040    
Infrastructure        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 6,634 $ 6,553    
Infrastructure | Property, plant and equipment [member] | Utilities [Member] | Discounted cash flows | Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal capitalization rate 700.00% 800.00%    
Infrastructure | Property, plant and equipment [member] | Utilities [Member] | Discounted cash flows | Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal capitalization rate 2300.00% 2100.00%    
Infrastructure | Goodwill [member] | Discounted cash flows | Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal capitalization rate 900.00%      
Actuarial assumption of discount rates 11.00%      
Infrastructure | Goodwill [member] | Discounted cash flows | Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal capitalization rate 1200.00%      
Actuarial assumption of discount rates 14.00%      
Private Equity        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 5,244 $ 5,218    
Terminal growth rate 2.60% 1.50%    
Terminal Year | yr 2,025 2,024    
Discount rate used in current estimate of value in use 9.90% 9.40%    
Real Estate        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 1,404 $ 1,357    
Growth rate used to extrapolate cash flow projections   2.80%    
Renewable Power        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 970 $ 977    
Renewable Power | Property, plant and equipment [member] | North America | Hydroelectric [Member] | Discounted cash flows | Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal capitalization rate 5.80% 6.20%    
Renewable Power | Property, plant and equipment [member] | North America | Hydroelectric [Member] | Discounted cash flows | Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Terminal capitalization rate 6.20% 6.70%    
Genesee and Wyoming [Member] | Infrastructure        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 2,042   $ 2,000  
Healthscope | Private Equity        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill 1,548      
Clarios | Private Equity        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill $ 1,894      
Center Parcs [Member] | Real Estate        
Disclosure of reconciliation of changes in goodwill [line items]        
Discount rate used in current estimate of value in use 9.50% 7.90%    
Growth rate used to extrapolate cash flow projections 3.00% 2.00%    
IFC Seoul | Real Estate        
Disclosure of reconciliation of changes in goodwill [line items]        
Discount rate used in current estimate of value in use 7.20% 7.50%    
Growth rate used to extrapolate cash flow projections 2.80% 2.80%