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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, 2020
Dec. 31, 2019
Utilities | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 7 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 23 21
Investment Horizon   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
Midstream | 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 5 years
Midstream | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Investment Horizon 10 years 10 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 0.07 0.07
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 0.13 0.13
Interest rate, measurement input | Midstream | 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