Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - MWh MWh in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2024
Commonwealth Edison Co
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required	1.3
PECO Energy Co
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10.00%
Baltimore Gas and Electric Company | Minimum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10.00%
Baltimore Gas and Electric Company | Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		20.00%
Delmarva Power and Light Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		50.00%