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Changes in Capital Structure - Equity Offering (Details) - USD ($)	3 Months Ended	9 Months Ended	47 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Aug. 06, 2020	Aug. 09, 2016
Class of Stock [Line Items]
Proceeds from issuance or sale of equity		$ 59,000,000
Shares of common stock sold (in shares)		2,542,594
Commission fees	$ 200,000	$ 600,000
Available for issuance under ATM program	$ 129,000,000	$ 129,000,000
Shares of stock acquired (in shares)		2,542,594
2016 ATM Program
Class of Stock [Line Items]
Aggregate sales price				$ 150,000,000
Proceeds from issuance or sale of equity		$ 38,000,000	$ 150,000,000
Shares of common stock sold (in shares)		1,749,665
2020 ATM Program
Class of Stock [Line Items]
Aggregate sales price					$ 150,000,000
Proceeds from issuance or sale of equity		$ 21,000,000
Shares of common stock sold (in shares)		792,929
Clearway Energy LLC
Class of Stock [Line Items]
Ownership interest (as a percentage)		57.58%
Clearway Energy LLC | CEG
Class of Stock [Line Items]
Ownership interest (as a percentage)		42.42%

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