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Long-term Debt - Narrative (Details) - USD ($) $ in Millions											1 Months Ended	2 Months Ended	4 Months Ended
	Sep. 30, 2025	Sep. 19, 2025	Sep. 04, 2025	Aug. 14, 2025	Aug. 13, 2025	Jun. 10, 2025	May 21, 2025	Apr. 29, 2025	Apr. 09, 2025	Mar. 20, 2025	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total debt	$ 8,490										$ 8,490	$ 8,490	$ 8,490	$ 7,235
Daggett 1 Drop Down
Debt Instrument [Line Items]
Unamortized debt issuance costs								$ 3
Payments for other fees		$ 7
Daggett 1 Drop Down | CEG
Debt Instrument [Line Items]
Net assets (liabilities) acquired (assumed)		33
Luna Valley Drop Down
Debt Instrument [Line Items]
Unamortized debt issuance costs								4
Payments for other fees			$ 9
Luna Valley Drop Down | CEG
Debt Instrument [Line Items]
Expected contributions upon substantial completion			50
Rosamond South I Drop Down
Debt Instrument [Line Items]
Unamortized debt issuance costs										$ 1
Payments for other fees				$ 9
Net assets (liabilities) acquired (assumed)										(3)
Rosamond South I Drop Down | CEG
Debt Instrument [Line Items]
Net assets (liabilities) acquired (assumed)				53
Payments to fund project reserve accounts										3
Company borrowed an additional												40
Rosamond South I Drop Down | Cash Equity Investor
Debt Instrument [Line Items]
Payments for asset acquisition										2
Rosamond South I Drop Down | Rosamond South Investment LLC | Clearway Renew LLC
Debt Instrument [Line Items]
Long -term debt payable on substantial completion					$ 29
Rosamond South I Drop Down | Rosamond South Investment LLC | Cash Equity Investor | Clearway Renew LLC
Debt Instrument [Line Items]
Long -term debt payable on substantial completion					$ 41
Pine Forest Drop Down
Debt Instrument [Line Items]
Unamortized debt issuance costs						$ 6
Dan’s Mountain Drop Down
Debt Instrument [Line Items]
Payments for other fees							$ 2
Dan’s Mountain Drop Down | CEG
Debt Instrument [Line Items]
Net assets (liabilities) acquired (assumed)							26
Dan’s Mountain Drop Down | Cash Equity Investor
Debt Instrument [Line Items]
Expected contributions upon substantial completion							45
Dan’s Mountain Drop Down | Dan’s Mountain
Debt Instrument [Line Items]
Additional payments for asset acquisition							43
Tuolumne Wind Acquisition
Debt Instrument [Line Items]
Asset acquisition, issuance cost								163
Buckthorn Solar Portfolio LLC
Debt Instrument [Line Items]
Repayments of debt									$ 112
Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	102										102	102	102
Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	1,048										1,048	1,048	1,048
Letter of Credit | Tuolumne Wind Acquisition
Debt Instrument [Line Items]
Asset acquisition, issuance cost								22
Letter of Credit | Buckthorn Solar Portfolio LLC
Debt Instrument [Line Items]
Long-term debt									22
Construction loans | Daggett 1 Drop Down
Debt Instrument [Line Items]
Long-term debt								92
Long-term debt, proceeds		31
Remaining balance to distribute		6
Long-term debt, additions	$ 40
Construction loans | Luna Valley Drop Down
Debt Instrument [Line Items]
Long-term debt			22					144
Long-term debt, proceeds			28
Long-term debt, additions											$ 51
Construction loans | Rosamond South I Drop Down
Debt Instrument [Line Items]
Long-term debt										179
Long-term debt, proceeds				13
Long-term debt, additions												$ 49
Construction loans | Pine Forest Drop Down
Debt Instrument [Line Items]
Long-term debt						103
Construction loans | Dan’s Mountain Drop Down
Debt Instrument [Line Items]
Long-term debt, additions							18
Tax Equity Bridge Loan | Daggett 1 Drop Down
Debt Instrument [Line Items]
Long-term debt								131
Long-term debt, proceeds		131
Tax Equity Bridge Loan | Luna Valley Drop Down
Debt Instrument [Line Items]
Long-term debt			144					144
Tax Equity Bridge Loan | Rosamond South I Drop Down
Debt Instrument [Line Items]
Long-term debt				276						284
Tax Equity Bridge Loan | Pine Forest Drop Down
Debt Instrument [Line Items]
Long-term debt						41
Tax Equity Bridge Loan | Dan’s Mountain Drop Down
Debt Instrument [Line Items]
Long-term debt, proceeds							91
Tax Equity Investor | Daggett 1 Drop Down
Debt Instrument [Line Items]
Long-term debt		108
Contributions from noncontrolling interests, net of distributions		38
Tax Equity Investor | Luna Valley Drop Down
Debt Instrument [Line Items]
Long-term debt			114
Payments for asset acquisition								18
Contributions from noncontrolling interests, net of distributions			29
Tax Equity Investor | Rosamond South I Drop Down
Debt Instrument [Line Items]
Long-term debt				226
Contributions from noncontrolling interests, net of distributions				58
Tax Equity Investor | Dan’s Mountain Drop Down
Debt Instrument [Line Items]
Long-term debt							90
Contributions from noncontrolling interests, net of distributions							18
Construction Loan | Daggett 1 Drop Down
Debt Instrument [Line Items]
Long-term debt, additions		$ 132
Construction Loan | Luna Valley Drop Down
Debt Instrument [Line Items]
Long-term debt, additions			195
Construction Loan | Rosamond South I Drop Down
Debt Instrument [Line Items]
Long-term debt, additions				$ 228
Cash Equity Bridge Loan | Luna Valley Drop Down
Debt Instrument [Line Items]
Long-term debt			$ 46					$ 64
Cash Equity Bridge Loan | Rosamond South I Drop Down
Debt Instrument [Line Items]
Long-term debt										6
Payments for other fees										$ 3
Cash Equity Bridge Loan | Pine Forest Drop Down
Debt Instrument [Line Items]
Long-term debt						102
Payments for asset acquisition						54
Long-term debt, additions													$ 44
Cash Equity Bridge Loan | Dan’s Mountain Drop Down
Debt Instrument [Line Items]
Remaining balance to distribute							70
Tax Credit Transfer Bridge Loan | Pine Forest Drop Down
Debt Instrument [Line Items]
Long-term debt						275
Cash Equity Investor | Pine Forest Drop Down
Debt Instrument [Line Items]
Contributions from noncontrolling interests, net of distributions						$ 9
Cash Equity Investor | Dan’s Mountain Drop Down
Debt Instrument [Line Items]
Payments for asset acquisition							$ 36
Term Loan | Tuolumne Wind Acquisition
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								1.625%
Term Loan | Buckthorn Solar Portfolio LLC
Debt Instrument [Line Items]
Long-term debt									$ 104
Debt instrument, basis spread on variable rate									1.625%

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