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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 15, 2017
Jul. 25, 2017
Mar. 31, 2018
Sep. 30, 2017
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       $ 55  
Other Payments to Acquire Businesses       $ 140  
Project Financing Disbursed     $ 78