Asset Retirement Obligations - Noncurrent Related Party Liabilities (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Asset Retirement Obligations [Line Items] | ||
| Payables related to Regulatory Agreement Units | $ 5,389 | $ 5,334 |
| Affiliated Entities | ComEd | ||
| Asset Retirement Obligations [Line Items] | ||
| Payables related to Regulatory Agreement Units | 4,297 | 4,313 |
| Affiliated Entities | PECO | ||
| Asset Retirement Obligations [Line Items] | ||
| Payables related to Regulatory Agreement Units | 533 | 442 |
| Affiliated Entities | CenterPoint | ||
| Asset Retirement Obligations [Line Items] | ||
| Payables related to Regulatory Agreement Units | 416 | 430 |
| Affiliated Entities | AEP Texas | ||
| Asset Retirement Obligations [Line Items] | ||
| Payables related to Regulatory Agreement Units | $ 143 | $ 149 |