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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Jan. 31, 2026 | Jan. 15, 2026 | Dec. 31, 2025
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Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | $ 292 |  |  | $ 587
Long Term Debt Current |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | 40 |  |  |
Debt Service Obligations |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | 90 |  |  |
Cash Distribution |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | 32 |  | $ 51 |
Cash Distribution | Rosie South TargetCo LLC |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash |  | $ 174 |  |
Operating Funds |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | 130 |  |  |
Project Level Subsidiaries |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents, held at project subsidiaries | $ 247 |  |  | $ 194

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