Income Taxes - Narrative (Details) - USD ($) $ in Millions				6 Months Ended	84 Months Ended
	Jan. 01, 2031	Jan. 01, 2023	Jul. 08, 2022	Jun. 30, 2022	Jan. 01, 2031	Mar. 31, 2022
Income Tax Additional Narrative Information [Line Items]
Income tax expense related to separation				$ 148
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				67
Income Tax Credits and Adjustments				15
Income Taxes Receivable, Current				31		$ 55
Notes Payable, Current				0		11
Notes Payable, Noncurrent				480		$ 484
Atlantic City Electric Company [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				179
PECO Energy Co [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				103
State and Local Jurisdiction [Member] | Atlantic City Electric Company [Member]
Income Tax Additional Narrative Information [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit				14
Federal and State
Income Tax Additional Narrative Information [Line Items]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				67
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				40
Income Tax Credits and Adjustments				17
Total transaction costs taxes relating to the Separation				24
PENNSYLVANIA
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				428
Increase (Decrease) in Deferred Income Taxes				390
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	4.99%	8.99%	9.99%		(0.50%)
Increase (Decrease) in Income Taxes				38
PENNSYLVANIA | PECO Energy Co [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				428
Increase (Decrease) in Deferred Income Taxes				390
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	4.99%	8.99%	9.99%		(0.50%)
Increase (Decrease) in Income Taxes				$ 38