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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 |  |

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