Income Taxes - Tax Years Open to Assessment (Details)	12 Months Ended
	Dec. 31, 2023
Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
State and Local Jurisdiction | DISTRICT OF COLUMBIA
Income Taxes [Line Items]
Open Tax Year	2020 2021 2022
State and Local Jurisdiction | ILLINOIS
Income Taxes [Line Items]
Open Tax Year	2012 2013 2014 2015 2016 2017 2018 2019 2021 2022
State and Local Jurisdiction | New Jersey Division of Taxation | Tax Year 2017-2018
Income Taxes [Line Items]
Open Tax Year	2017 2018
State and Local Jurisdiction | New Jersey Division of Taxation | Tax Year 2019-2021
Income Taxes [Line Items]
Open Tax Year	2019 2020 2021 2022
State and Local Jurisdiction | New York State Division of Taxation and Finance
Income Taxes [Line Items]
Open Tax Year	2015 2016 2017 2018 2019 2020 2021 2022
State and Local Jurisdiction | PENNSYLVANIA | Tax Year 2019-2021
Income Taxes [Line Items]
Open Tax Year	2020 2021 2022
Delmarva Power & Light Company | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Delmarva Power & Light Company | State and Local Jurisdiction | DELAWARE
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Delmarva Power & Light Company | State and Local Jurisdiction | MARYLAND
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Atlantic City Electric Company | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Atlantic City Electric Company | State and Local Jurisdiction | New Jersey Division of Taxation
Income Taxes [Line Items]
Open Tax Year	2019 2020 2021 2022
PECO Energy Co | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
PECO Energy Co | State and Local Jurisdiction | PENNSYLVANIA
Income Taxes [Line Items]
Open Tax Year	2020 2021 2022
Potomac Electric Power Company | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Potomac Electric Power Company | State and Local Jurisdiction | DISTRICT OF COLUMBIA
Income Taxes [Line Items]
Open Tax Year	2020 2021 2022
Potomac Electric Power Company | State and Local Jurisdiction | MARYLAND
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Baltimore Gas and Electric Company | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Baltimore Gas and Electric Company | State and Local Jurisdiction | MARYLAND
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Pepco Holdings LLC | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Pepco Holdings LLC | State and Local Jurisdiction | DISTRICT OF COLUMBIA
Income Taxes [Line Items]
Open Tax Year	2020 2021 2022
Commonwealth Edison Co | Domestic Tax Authority
Income Taxes [Line Items]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Commonwealth Edison Co | State and Local Jurisdiction | ILLINOIS
Income Taxes [Line Items]
Open Tax Year	2012 2013 2014 2015 2016 2017 2018 2019 2021 2022