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