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Long-term Debt - Narrative (Details) - USD ($)				3 Months Ended			6 Months Ended
	May 03, 2022	Mar. 25, 2022	Mar. 16, 2022	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2027	Jun. 30, 2026	Dec. 31, 2021
Debt Instrument [Line Items]
Proceeds from the revolving credit facility							$ 80,000,000	$ 300,000,000
Payments for the revolving credit facility							325,000,000	233,000,000
Total debt				$ 7,127,000,000	$ 7,127,000,000		7,127,000,000				$ 7,778,000,000
Loss on debt extinguishment					0	$ 0	(2,000,000)	$ (42,000,000)
Mililani I Drop Down
Debt Instrument [Line Items]
Long-term debt		$ 100,000,000
Mililani I Drop Down | Tax Equity Investors
Debt Instrument [Line Items]
Payments to fund project reserve accounts		15,000,000
Mililani I Drop Down | CEG
Debt Instrument [Line Items]
Repayment of debt at asset acquisition		27,000,000
Payments for associated fees		2,000,000
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding				0	0		0
Proceeds from the revolving credit facility							80,000,000
Payments for the revolving credit facility							325,000,000
Repayments of debt	$ 305,000,000
Total debt				0	0		0				245,000,000
Bridge Loan, Due 2022
Debt Instrument [Line Items]
Repayments of debt	$ 335,000,000
Total debt				0	0		$ 0				335,000,000
Bridge Loan, Due 2022 | SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate							1.25%
Viento Funding II, LLC Due 2023 and 2029
Debt Instrument [Line Items]
Total debt			$ 190,000,000	188,000,000	188,000,000		$ 188,000,000				$ 29,000,000
Viento Funding II, LLC Due 2023 and 2029 | Forecast
Debt Instrument [Line Items]
Effective interest rate, percent									1.50%	1.35%
Viento Funding II, LLC Due 2023 and 2029 | SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate							0.10%
Laredo Ridge, Due 2028; Tapestry Wind, LLC, Due 2031; and Viento Funding II, LLC, Due 2023
Debt Instrument [Line Items]
Repayments of debt			186,000,000
Loss on debt extinguishment			2,000,000
Letter of Credit | Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023
Debt Instrument [Line Items]
Letters of credit outstanding, amount				87,000,000	87,000,000		$ 87,000,000
Letter of Credit | Bridge Loan, Due 2022
Debt Instrument [Line Items]
Letters of credit outstanding, amount
Letter of Credit | Viento Funding II, LLC Due 2023 and 2029
Debt Instrument [Line Items]
Letters of credit outstanding, amount				26,000,000	26,000,000		26,000,000
Debt instrument, face amount			$ 35,000,000
Construction loans | Mililani I Drop Down
Debt Instrument [Line Items]
Long-term debt		16,000,000
Long-term debt, additions				$ 22,000,000
Long-term debt, outstanding					$ 38,000,000
Tax Equity Bridge Loan | Mililani I Drop Down
Debt Instrument [Line Items]
Long-term debt		60,000,000					$ 60,000,000
Sponsor Equity Bridge Loan | Mililani I Drop Down
Debt Instrument [Line Items]
Long-term debt		27,000,000
Sponsor Equity Bridge Loan | Mililani I Drop Down | Tax Equity Investors
Debt Instrument [Line Items]
Repayment of debt at asset acquisition		$ 14,000,000

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