Summary of Significant Accounting Policies and Estimates - Non-controlling Interest (Details) |
Dec. 31, 2024 |
Sep. 30, 2024 |
|---|---|---|
| Fluence Energy, LLC | ||
| Noncontrolling Interest [Line Items] | ||
| Fluence Energy, LLC percentage owned | 71.61% | 71.53% |
| AES Grid Stability | ||
| Noncontrolling Interest [Line Items] | ||
| Founders percentage owned | 28.39% | 28.47% |