Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Jan. 31, 2026 |
Jan. 15, 2026 |
Dec. 31, 2025 |
|---|---|---|---|---|
| Summary of Significant Accounting Policies [Line Items] | ||||
| Restricted cash | $ 413 | $ 587 | ||
| Long Term Debt Current | ||||
| Summary of Significant Accounting Policies [Line Items] | ||||
| Restricted cash | 101 | |||
| Debt Service Obligations | ||||
| Summary of Significant Accounting Policies [Line Items] | ||||
| Restricted cash | 91 | |||
| Cash Distribution | ||||
| Summary of Significant Accounting Policies [Line Items] | ||||
| Restricted cash | 44 | $ 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 | 177 | |||
| Project Level Subsidiaries | ||||
| Summary of Significant Accounting Policies [Line Items] | ||||
| Cash and cash equivalents, held at project subsidiaries | $ 282 | $ 194 |