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Debt and Credit Agreements (All Registrants) - Commercial Paper Borrowings (Details) - Commercial Paper - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Short-term Debt [Line Items]    
Commercial paper $ 820 $ 1,938
Short-term debt, weighted average interest rate, at point in time 5.44% 4.77%
Corporate    
Short-term Debt [Line Items]    
Commercial paper $ 311 $ 449
Commonwealth Edison Co    
Short-term Debt [Line Items]    
Commercial paper $ 277 $ 427
Short-term debt, weighted average interest rate, at point in time 5.42% 4.71%
PECO Energy Co    
Short-term Debt [Line Items]    
Commercial paper $ 0 $ 239
Short-term debt, weighted average interest rate, at point in time 0.00% 4.71%
Baltimore Gas and Electric Company    
Short-term Debt [Line Items]    
Commercial paper $ 59 $ 409
Short-term debt, weighted average interest rate, at point in time 5.43% 4.81%
Pepco Holdings LLC    
Short-term Debt [Line Items]    
Commercial paper $ 173 $ 414
Short-term debt, weighted average interest rate, at point in time 5.47% 4.78%
Potomac Electric Power Company    
Short-term Debt [Line Items]    
Commercial paper $ 0 $ 299
Short-term debt, weighted average interest rate, at point in time 0.00% 4.79%
Delmarva Power and Light Company    
Short-term Debt [Line Items]    
Commercial paper $ 0 $ 115
Short-term debt, weighted average interest rate, at point in time 0.00% 4.76%
Atlantic City Electric Company    
Short-term Debt [Line Items]    
Commercial paper $ 173 $ 0
Short-term debt, weighted average interest rate, at point in time 5.47% 0.00%