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DISPOSAL OF ASSETS - Narrative (Details)
R in Millions, $ in Millions
1 Months Ended 4 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2019
ZAR (R)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Investment [Line Items]          
Total consideration       $ 291  
Loss on disposal       14  
Revaluation increase in property, plant and equipment       $ 1,971 $ 4,558
One Hundred Forty-Six MW Portfolio - South Africa          
Investment [Line Items]          
Total consideration   $ 112 R 1,651    
Loss on disposal   8      
Total proceeds (net of foreign exchange contract settlements)   135      
Revaluation increase in property, plant and equipment   $ 42      
Ownership interest   31.00% 31.00%    
Accumulated revaluation surplus reclassified from AOCI   $ 13      
One Hundred Forty-Six MW Portfolio - South Africa | Brookfield Renewable          
Investment [Line Items]          
Total proceeds (net of foreign exchange contract settlements)   42      
One Hundred Ninety-One MW Portfolio - Northern Ireland And Portugal          
Investment [Line Items]          
Total consideration $ 186        
Loss on disposal   $ 6      
Revaluation increase in property, plant and equipment $ 83        
Ownership interest 40.00%        
Accumulated revaluation surplus reclassified from AOCI $ 49        
One Hundred Ninety-One MW Portfolio - Northern Ireland And Portugal | Brookfield Renewable          
Investment [Line Items]          
Total consideration $ 74