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Acquisitions (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 25, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Aug. 03, 2017
sPower [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 461 |  |  |
Alto Sertao II [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 143 |  |
Non Recourse Debt Total |  |  |  | $ 363
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00%
Business Combination, Contingent Consideration, Liability |  |  |  | $ 32
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  | $ 189
Bauru Solar Complex [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 60 |
Other Payments to Acquire Businesses |  |  | $ 150 |

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