Consolidated Statements Of Cash Flows (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES
Net income (loss)	$ 158	$ (18)
(Income) loss from discontinued operations	(1)	122
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	210	182
Non-cash rents from cross-border energy lease investments	(28)	(26)
Gain on early termination of finance leases held in trust	(39)
Deferred income taxes	61	53
Other	(10)	(7)
Changes in:
Accounts receivable	63	(20)
Inventories	(4)	(6)
Prepaid expenses	(34)	(28)
Regulatory assets and liabilities, net	(40)	(105)
Accounts payable and accrued liabilities	(71)	74
Pension contributions	(110)
Pension benefit obligation, excluding contributions	26	34
Cash collateral related to derivative activities	44	4
Taxes accrued	34	50
Other assets and liabilities	33	50
Conectiv Energy net assets held for sale	42	140
Net Cash From Operating Activities	334	499
INVESTING ACTIVITIES
Investment in property, plant and equipment	(387)	(364)
Department of Energy capital reimbursement awards received	16
Proceeds from early termination of finance leases held in trust	161
Changes in restricted cash equivalents	(3)	3
Net other investing activities	(7)	(1)
Investment in property, plant and equipment associated with Conectiv Energy assets held for sale		(111)
Net Cash Used By Investing Activities	(220)	(473)
FINANCING ACTIVITIES
Dividends paid on common stock	(122)	(120)
Common stock issued for the Dividend Reinvestment Plan and employee related compensation	25	25
Redemption of preferred stock of subsidiaries	(6)
Issuances of long-term debt	235	102
Reacquisition of long-term debt	(52)	(482)
(Repayments) issuances of short-term debt, net	(139)	458
Cost of issuances	(2)	(7)
Net other financing activities	(16)	(18)
Net financing activities associated with Conectiv Energy assets held for sale		6
Net Cash Used By Financing Activities	(77)	(36)
Net Increase (Decrease) in Cash and Cash Equivalents	37	(10)
Cash and Cash Equivalents at Beginning of Period	20
Cash and Cash Equivalents at Beginning of Period	21	44
CASH AND CASH EQUIVALENTS AT END OF PERIOD	58	34
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash received for income taxes, net	2	1
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net income (loss)	50	40
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	84	78
Deferred income taxes	17	23
Changes in:
Accounts receivable	(9)	(47)
Regulatory assets and liabilities, net	(1)	(15)
Accounts payable and accrued liabilities	(8)	18
Pension contributions	(40)
Taxes accrued	62	37
Other assets and liabilities	17	20
Net Cash From Operating Activities	172	154
INVESTING ACTIVITIES
Investment in property, plant and equipment	(205)	(136)
Department of Energy capital reimbursement awards received	14
Changes in restricted cash equivalents		1
Net other investing activities	(6)	1
Net Cash Used By Investing Activities	(197)	(134)
FINANCING ACTIVITIES
Dividends paid on common stock		(50)
Reacquisition of long-term debt		(16)
Net other financing activities	(5)	(10)
Net Cash Used By Financing Activities	(5)	(76)
Net Increase (Decrease) in Cash and Cash Equivalents	(30)	(56)
Cash and Cash Equivalents at Beginning of Period	88	213
CASH AND CASH EQUIVALENTS AT END OF PERIOD	58	157
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash received for income taxes, net	71	16
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net income (loss)	45	20
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	44	40
Deferred income taxes	40	3
Changes in:
Accounts receivable	28	17
Inventories	1	2
Regulatory assets and liabilities, net	(5)	(6)
Accounts payable and accrued liabilities	(24)	7
Pension contributions	(40)
Taxes accrued	(25)	15
Other assets and liabilities	17	29
Net Cash From Operating Activities	81	127
INVESTING ACTIVITIES
Investment in property, plant and equipment	(99)	(133)
Net other investing activities	(1)	(1)
Net Cash Used By Investing Activities	(100)	(134)
FINANCING ACTIVITIES
Dividends paid on common stock		(23)
Issuances of long-term debt	35	78
Reacquisition of long-term debt	(35)
Net other financing activities		(5)
Net Cash Used By Financing Activities		50
Net Increase (Decrease) in Cash and Cash Equivalents	(19)	43
Cash and Cash Equivalents at Beginning of Period	69	26
CASH AND CASH EQUIVALENTS AT END OF PERIOD	50	69
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash received for income taxes, net	(8)	3
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net income (loss)	24	24
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	66	49
Deferred income taxes	30	7
Changes in:
Accounts receivable		(19)
Regulatory assets and liabilities, net	(34)	(84)
Accounts payable and accrued liabilities	(5)	(24)
Pension contributions	(30)
Prepaid New Jersey sales and excise tax	(56)	(52)
Taxes accrued	13	22
Other assets and liabilities	11	8
Net Cash From Operating Activities	19	(69)
INVESTING ACTIVITIES
Investment in property, plant and equipment	(60)	(76)
Department of Energy capital reimbursement awards received	2
Net other investing activities	(3)	2
Net Cash Used By Investing Activities	(61)	(74)
FINANCING ACTIVITIES
Capital contribution from Parent		23
Redemption of preferred stock of subsidiaries	(6)
Issuances of long-term debt	200	23
Reacquisition of long-term debt	(17)	(16)
(Repayments) issuances of short-term debt, net	(133)	110
Net other financing activities	(2)
Net Cash Used By Financing Activities	42	140
Net Increase (Decrease) in Cash and Cash Equivalents		(3)
Cash and Cash Equivalents at Beginning of Period	4	7
CASH AND CASH EQUIVALENTS AT END OF PERIOD	4	4
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash received for income taxes, net	$ 18	$ (1)