Statements of Cash Flows - Pepco (Parentheticals) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
(Decrease) increase in capital expenditures not paid	$ (215)	$ 36	$ 16
Potomac Electric Power Company
(Decrease) increase in capital expenditures not paid	$ (55)	$ 65	$ 30

The non cash impact of change in capital expenditures incurred but not yet paid.

No definition available.

Name:	exc_ChangeinCapitalExpendituresIncurredButNotYetPaid
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration