Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Income Tax Contingency [Line Items] | ||
| Unrecognized tax benefits | $ 101 | $ 96 |
| Offsetting receivable | 4,411 | 4,026 |
| Constellation Energy Corp | ||
| Income Tax Contingency [Line Items] | ||
| Unrecognized tax benefits | 31 | 31 |
| Deferred Costs and Other Assets | ||
| Income Tax Contingency [Line Items] | ||
| Offsetting receivable | 31 | 31 |
| Pepco Holdings LLC | ||
| Income Tax Contingency [Line Items] | ||
| Unrecognized tax benefits | 52 | 48 |
| Delmarva Power and Light Company | ||
| Income Tax Contingency [Line Items] | ||
| Unrecognized tax benefits | $ 16 | $ 12 |