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Acquisitions (Details) - sPower [Member]
$ in Millions
Feb. 19, 2017
USD ($)
Business Acquisition [Line Items]  
Payments to Acquire Businesses, Net of Cash Acquired $ 853
Non Recourse Debt Total $ 720
Business Acquisition, Percentage of Voting Interests Acquired 50.00%
Business Combination, Contingent Consideration, Liability $ 75