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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Income Tax Contingency [Line Items] |  |
Unrecognized tax benefits | $ 85 | $ 94
Offsetting receivable | 4,322 | 3,232
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 | 38 | 51
Atlantic City Electric Company |  |
Income Tax Contingency [Line Items] |  |
Unrecognized tax benefits | $ 1 | $ 15

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