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Acquisitions Acquistions (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 16, 2016 | Nov. 01, 2018 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |
Distributed Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  | $ 43,000,000 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |
Business Combination, Ownership Percentage in Acquiree |  | 100.00% |  |  |  |  | 100.00% |  |  |  |  |
Business Combination, Equity Interest in Acquiree, Remeasurement Gain (Loss) |  | $ 5,000,000 |  |  |  |  | $ 5,000,000 |  |  |  |  |
Alto Sertao II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 179,000,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  | 346,000,000 |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 143,000,000 |  |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |
Bauru Solar Complex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Purchase Price |  |  |  |  |  | $ 152,000,000 |  |  |  |  |  |
Project Financing Disbursed |  |  |  |  |  | 119,000,000 |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  |  |  |  | $ 33,000,000 |  |  |  |  |  |
Na Pua Makani Power Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  | 100.00% |
Business Combination, Consideration Transferred |  | 11,000,000 |  |  | $ 53,000,000 |  |  |  |  |  |  |
Business Combination, Contingent Consideration |  | $ 5,000,000 |  |  | $ 48,000,000 |  |  |  |  |  |  |
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset | [1] |  |  |  |  |  | $ 32,000,000 |  |  |  |  |
[1] | Related to the amendment of the Oahu purchase agreement. See Note 24 —Acquisitions for further information.

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