Schedule I - Condensed Financial Information Of Parent Company (Statements of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
OPERATING ACTIVITIES
Net Income	$ 257	$ 32	$ 235
Loss (income) from discontinued operations, net of income taxes	3	107	(12)
Adjustments to reconcile net income to net cash from operating activities:
Deferred income taxes	140	345	249
Changes in:
Other assets and liabilities	43	49	7
Net Cash From Operating Activities	686	813	606
INVESTING ACTIVITIES
Proceeds from sale of Conectiv Energy wholesale power generation business		1,640
Net Cash (Used By) From Investing Activities	(747)	718	(860)
FINANCING ACTIVITIES
Dividends paid on common stock	(244)	(241)	(238)
Common stock issued for the Dividend Reinvestment Plan and employee-related compensation	47	47	49
Issuances of long-term debt	235	383	110
Reacquisitions of long-term debt	(70)	(1,726)	(83)
Issuances (repayments) of short-term debt, net	198	4	65
Cost of issuances	(10)	(7)	(4)
Net Cash (Used By) From Financing Activities	149	(1,556)	(84)
Net Increase (Decrease) in Cash and Cash Equivalents	88	(25)	(338)
Cash and Cash Equivalents at Beginning of Year	20	44
CASH AND CASH EQUIVALENTS AT END OF YEAR	109	20	44
Parent Company [Member]
OPERATING ACTIVITIES
Net Income	257	32	235
Loss (income) from discontinued operations, net of income taxes	3	107	(12)
Adjustments to reconcile net income to net cash from operating activities:
Distributions from related parties less than earnings	(207)	(150)	(186)
Deferred income taxes	(16)	(5)
Changes in:
Prepaid and other	23	24	(24)
Accounts payable	2	1	(4)
Interest and taxes	42	(130)	19
Other assets and liabilities	11	31	16
Net Cash From Operating Activities	115	(90)	44
INVESTING ACTIVITIES
Proceeds from sale of Conectiv Energy wholesale power generation business		1,035
Net Cash (Used By) From Investing Activities		1,035
FINANCING ACTIVITIES
Dividends paid on common stock	(244)	(241)	(238)
Common stock issued for the Dividend Reinvestment Plan and employee-related compensation	47	47	49
Issuances of long-term debt		250
Capital distribution to subsidiaries	(20)	(31)	(255)
Reacquisitions of long-term debt		(1,644)
Decrease in notes receivable from associated companies		318	156
Issuances (repayments) of short-term debt, net	235	(94)	274
Cost of issuances	(7)	(4)	(1)
Net Cash (Used By) From Financing Activities	11	(1,399)	(15)
Net Increase (Decrease) in Cash and Cash Equivalents	126	(454)	29
Cash and Cash Equivalents at Beginning of Year	131	585	556
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 257	$ 131	$ 585