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Long-term Debt - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 4 Months Ended |
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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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