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Acquisitions (Details) - USD ($) $ in Millions				3 Months Ended		9 Months Ended
	Jan. 01, 2018	Nov. 15, 2017	Jul. 25, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Mar. 31, 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, Consideration Transferred					$ 179
Payments to Acquire Businesses, Net of Cash Acquired					143
Non Recourse Debt Total					$ 346
Payment for Contingent Consideration Liability, Financing Activities				$ 12
Business Combination, Contingent Consideration, Liability							$ 18
Fluence [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 50
Business Acquisition, Percentage of Voting Interests Acquired	50.00%
Bauru Solar Complex [Member]
Business Acquisition [Line Items]
Asset Acquisition, Purchase Price						$ 152
Project Financing Disbursed						119
Asset Acquisition, Consideration Transferred						$ 33

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