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Summary of Significant Accounting Policies - Noncontrolling Interests (Details) - $ / shares				3 Months Ended
	Dec. 15, 2020	Dec. 01, 2020	Oct. 27, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Common Class B
Summary of Significant Accounting Policies [Line Items]
Distribution made to limited liability company (LLC) member, distributions paid, per unit (in dollars per share)				$ 0.3125	$ 0.2100	$ 0.2100
Common Class D
Summary of Significant Accounting Policies [Line Items]
Distribution made to limited liability company (LLC) member, distributions paid, per unit (in dollars per share)				$ 0.3125	$ 0.2100	$ 0.2100
Subsequent Event
Summary of Significant Accounting Policies [Line Items]
Common stock, dividends, per share, declared (in dollars per share)			$ 0.318
Dividends payable, date to be paid	Dec. 15, 2020
Dividends payable, date of record		Dec. 01, 2020
Clearway Energy LLC | Subsequent Event
Summary of Significant Accounting Policies [Line Items]
Dividends payable, date declared			Oct. 27, 2020
Common stock, dividends, per share, declared (in dollars per share)			$ 0.318
Dividends payable, date to be paid	Dec. 15, 2020
Dividends payable, date of record		Dec. 01, 2020

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