Acquisitions (Details) $ in Millions	1 Months Ended
	Sep. 30, 2018 USD ($) MW
Sempra Solar Holdings, LLC
Business Acquisition [Line Items]
Ownership percentage	50.00%
Sempra Solar Holdings, LLC | Renewable Electric Production Projects
Business Acquisition [Line Items]
Project generating capacity (in mw) | MW	379
Con Edison Development | Renewable Electric Production Projects
Business Acquisition [Line Items]
Project debt	$ 506
Sempra Solar Holdings, LLC | Renewable Electric Production Projects
Business Acquisition [Line Items]
Project generating capacity (in mw) | MW	981
Project debt	$ 576
Sempra Solar Holdings, LLC
Business Acquisition [Line Items]
Purchase price	1,540
Sempra Solar Holdings, LLC | Con Edison Development
Business Acquisition [Line Items]
Purchase price	$ 1,540