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PROPERTY, PLANT AND EQUIPMENT - Valuation Technique (Details) - Property, plant and equipment - Recurring fair value measurement - Discounted cash flow model
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Utilities | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 8 8
Investment Horizon 10 years 10 years
Utilities | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 21 22
Investment Horizon 20 years 20 years
Transport | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 9 9
Investment Horizon 10 years 10 years
Transport | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 14 14
Investment Horizon 20 years 20 years
Energy    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Investment Horizon   10 years
Energy | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 10 10
Investment Horizon 5 years  
Energy | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 17 14
Investment Horizon 10 years  
Data Infrastructure    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Investment Horizon   10 years
Data Infrastructure | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 11 10
Investment Horizon 10 years  
Data Infrastructure | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 17 11
Investment Horizon 11 years  
Interest rate, measurement input | Utilities | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.07 0.07
Interest rate, measurement input | Utilities | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.14 0.14
Interest rate, measurement input | Transport | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.09 0.10
Interest rate, measurement input | Transport | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.14 0.13
Interest rate, measurement input | Energy | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.12 0.12
Interest rate, measurement input | Energy | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.15 0.15
Interest rate, measurement input | Data Infrastructure | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.13 0.13
Interest rate, measurement input | Data Infrastructure | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Significant unobservable input, assets 0.15 0.15