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Acquisitions (Details) - USD ($)
$ in Millions
Apr. 18, 2017
Feb. 19, 2017
sPower [Member]    
Business Acquisition [Line Items]    
Payments to Acquire Businesses, Net of Cash Acquired   $ 853
Business Acquisition, Percentage of Voting Interests Acquired   50.00%
Alto Sertao II [Member]    
Business Acquisition [Line Items]    
Payments to Acquire Businesses, Net of Cash Acquired $ 180  
Non Recourse Debt Total 350  
Business Combination, Contingent Consideration, Liability $ 30