Non-Controlling Interest (Details) (USD $) In Millions	0 Months Ended	6 Months Ended
Feb. 25, 2011	Jun. 30, 2011
Redemption of preferred stock of subsidiaries		$ 6
Atlantic City Electric Co [Member]
Redemption of preferred stock of subsidiaries	$ 6	$ 6

The cash outflow for reacquisition of callable preferred stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph a

Name:	us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration