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ACQUISITIONS - European Wind (Details) - European Wind
£ in Millions, $ in Millions
1 Months Ended
Aug. 31, 2017
USD ($)
Aug. 31, 2017
GBP (£)
Aug. 31, 2017
USD ($)
Feb. 28, 2017
Disclosure of detailed information about business combination [line items]        
Percentage of voting equity interests acquired       100.00%
Consideration transferred, acquisition-date fair value   £ 24 $ 32  
Percentage of voting equity interests retained by Brookfield   40.00% 40.00%  
Acquisition costs incurred and capitalized $ 1