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Debt and Credit Agreements (All Registrants) - Commercial Paper Borrowings (Details) - Commercial Paper - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Short-term Debt [Line Items] |  |
Commercial paper | $ 531 | $ 1,624
Short-term debt, weighted average interest rate, at point in time | 4.94% | 5.58%
Corporate |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 240 | $ 527
Commonwealth Edison Co |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 73 | $ 202
Short-term debt, weighted average interest rate, at point in time | 4.90% | 5.53%
PECO Energy Co |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 0 | $ 165
Short-term debt, weighted average interest rate, at point in time | 0.00% | 5.57%
Baltimore Gas and Electric Company |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 0 | $ 336
Short-term debt, weighted average interest rate, at point in time | 0.00% | 5.59%
Pepco Holdings LLC |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 218 | $ 394
Short-term debt, weighted average interest rate, at point in time | 4.94% | 5.60%
Potomac Electric Power Company |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 49 | $ 132
Short-term debt, weighted average interest rate, at point in time | 4.93% | 5.59%
Delmarva Power and Light Company |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 0 | $ 63
Short-term debt, weighted average interest rate, at point in time | 0.00% | 5.60%
Atlantic City Electric Company |  |
Short-term Debt [Line Items] |  |
Commercial paper | $ 169 | $ 199
Short-term debt, weighted average interest rate, at point in time | 4.94% | 5.60%

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