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Acquisitions (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Nov. 15, 2017
Jul. 25, 2017
Jun. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Jan. 01, 2018
sPower [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired $ 19 $ 461        
Alto Sertao II [Member]            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration, Liability         $ 18  
Fluence [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Percentage of Voting Interests Acquired           50.00%
Bauru Solar Complex [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired       $ 45    
Other Payments to Acquire Businesses       $ 120    
Project Financing Disbursed     $ 67