Nature of Business (Details)	9 Months Ended
	Sep. 30, 2020 MW
Nature of Business [Line Items]
Weighted average remaining contract duration	13 years
Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind
Nature of Business [Line Items]
Power generation capacity, megawatts	6,201
Thermal
Nature of Business [Line Items]
Power generation capacity, megawatts	39
Steam and chilled water capacity, megawatts thermal equivalent	1,456
Clearway Energy LLC
Nature of Business [Line Items]
Ownership interest (as a percentage)	57.58%
CEG | Clearway Energy LLC
Nature of Business [Line Items]
Ownership interest (as a percentage)	42.42%
CEG | Clearway Energy, Inc.
Nature of Business [Line Items]
Ownership interest (as a percentage)	54.94%
Public Shareholders | Clearway Energy, Inc.
Nature of Business [Line Items]
Ownership interest (as a percentage)	45.06%