Derivative Financial Instruments - Summary of Derivative Hedging Instruments (Details) - MWh MWh in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2023
Commonwealth Edison Co
Derivative [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required	1.3
PECO Energy Co
Derivative [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10.00%
Baltimore Gas and Electric Company | Minimum
Derivative [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10.00%
Baltimore Gas and Electric Company | Maximum
Derivative [Line Items]
Estimated Percent of Gas Purchases Being Hedged		20.00%
Delmarva Power & Light Company
Derivative [Line Items]
Estimated Percent of Gas Purchases Being Hedged		50.00%