Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net (loss) income	$ (270)	$ 242
Loss (income) from discontinued operations	322	(58)
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	352	343
Deferred income taxes	(386)	279
Impairment losses		5
Other	(9)	(11)
Changes in:
Accounts receivable	(55)	(90)
Inventories	(15)	(33)
Prepaid expenses	6	(31)
Regulatory assets and liabilities, net	(74)	(104)
Accounts payable and accrued liabilities	(41)	45
Pension contributions	(120)	(200)
Pension benefit obligation, excluding contributions	49	49
Cash collateral related to derivative activities	28	76
Income tax-related prepayments, receivables and payables	618	(133)
Advanced payment made to taxing authority	(242)
Interest accrued	37	38
Other assets and liabilities	27	23
Net current assets held for disposition	40	(21)
Net Cash From Operating Activities	267	419
INVESTING ACTIVITIES
Investment in property, plant and equipment	(943)	(888)
Department of Energy capital reimbursement awards received	17	25
Changes in restricted cash equivalents	(2)	(2)
Net other investing activities		1
Proceeds from disposal of assets held for disposition	873	202
Net Cash Used By Investing Activities	(55)	(662)
FINANCING ACTIVITIES
Dividends paid on common stock	(201)	(185)
Common stock issued for the Dividend Reinvestment Plan and employee-related compensation	38	40
Issuances of common stock	324
Issuances of long-term debt	350	450
Reacquisitions of long-term debt	(96)	(165)
(Repayments) issuances of short-term debt, net	(361)	(84)
Issuances of term loans	250	200
Repayments of term loans	(450)
Cost of issuances	(17)	(8)
Net other financing activities	(16)
Net Cash (Used By) From Financing Activities	(179)	248
Net (Decrease) Increase in Cash and Cash Equivalents	33	5
Cash and Cash Equivalents at Beginning of Period	25	109
CASH AND CASH EQUIVALENTS AT END OF PERIOD	58	114
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid (received) for income taxes, net	228	(2)
Non-cash activities
Reclassification of property, plant and equipment to regulatory assets		90
Reclassification of asset removal costs regulatory liability to accumulated depreciation		61
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net (loss) income	126	101
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	147	143
Deferred income taxes	110	170
Changes in:
Accounts receivable	(59)	(31)
Inventories	(3)	(21)
Prepaid expenses	(8)	5
Regulatory assets and liabilities, net	(74)	(67)
Accounts payable and accrued liabilities	3	29
Pension contributions		(85)
Pension benefit obligation, excluding contributions	16	16
Income tax-related prepayments, receivables and payables	(50)	(86)
Interest accrued	21	22
Other assets and liabilities	(2)	(6)
Net Cash From Operating Activities	227	190
INVESTING ACTIVITIES
Investment in property, plant and equipment	(403)	(449)
Department of Energy capital reimbursement awards received	16	23
Changes in restricted cash equivalents	(3)
Net other investing activities	(8)	(1)
Net Cash Used By Investing Activities	(398)	(427)
FINANCING ACTIVITIES
Dividends paid on common stock	(46)	(35)
Capital contribution from Parent	175	50
Issuances of long-term debt	250	200
Reacquisitions of long-term debt		(38)
(Repayments) issuances of short-term debt, net	(200)	60
Cost of issuances	(4)	(4)
Net other financing activities	(5)	(3)
Net Cash (Used By) From Financing Activities	170	230
Net (Decrease) Increase in Cash and Cash Equivalents	(1)	(7)
Cash and Cash Equivalents at Beginning of Period	9	12
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8	5
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid (received) for income taxes, net	(26)	(40)
Non-cash activities
Reclassification of property, plant and equipment to regulatory assets		53
Reclassification of asset removal costs regulatory liability to accumulated depreciation		19
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net (loss) income	61	56
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	79	78
Deferred income taxes	48	44
Changes in:
Accounts receivable	26	(6)
Inventories	(10)	(11)
Regulatory assets and liabilities, net	(35)	(16)
Accounts payable and accrued liabilities	(21)	2
Pension contributions	(10)	(85)
Income tax-related prepayments, receivables and payables		11
Interest accrued	9	8
Other assets and liabilities	10	7
Net Cash From Operating Activities	157	88
INVESTING ACTIVITIES
Investment in property, plant and equipment	(249)	(219)
Net other investing activities	1	(4)
Net Cash Used By Investing Activities	(248)	(223)
FINANCING ACTIVITIES
Dividends paid on common stock	(30)
Capital contribution from Parent		60
Issuances of long-term debt		250
Reacquisitions of long-term debt		(97)
(Repayments) issuances of short-term debt, net	118	(47)
Cost of issuances		(3)
Net other financing activities	1	8
Net Cash (Used By) From Financing Activities	89	171
Net (Decrease) Increase in Cash and Cash Equivalents	(2)	36
Cash and Cash Equivalents at Beginning of Period	6	5
CASH AND CASH EQUIVALENTS AT END OF PERIOD	4	41
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid (received) for income taxes, net	(8)	(24)
Non-cash activities
Reclassification of property, plant and equipment to regulatory assets		37
Reclassification of asset removal costs regulatory liability to accumulated depreciation		42
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net (loss) income	41	36
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	101	92
Deferred income taxes	43	72
Changes in:
Accounts receivable	(23)	(47)
Inventories	(2)	(5)
Prepaid expenses	(11)	(12)
Regulatory assets and liabilities, net	35	(20)
Accounts payable and accrued liabilities	2	26
Pension contributions	(30)	(30)
Income tax-related prepayments, receivables and payables	(1)	(51)
Other assets and liabilities	15	13
Net Cash From Operating Activities	170	74
INVESTING ACTIVITIES
Investment in property, plant and equipment	(204)	(186)
Department of Energy capital reimbursement awards received	1	2
Net other investing activities	1	(3)
Net Cash Used By Investing Activities	(202)	(187)
FINANCING ACTIVITIES
Dividends paid on common stock	(25)	(35)
Capital contribution from Parent	75
Issuances of long-term debt	100
Reacquisitions of long-term debt	(96)	(30)
(Repayments) issuances of short-term debt, net	(16)	93
Net other financing activities	(6)	1
Net Cash (Used By) From Financing Activities	32	29
Net (Decrease) Increase in Cash and Cash Equivalents		(84)
Cash and Cash Equivalents at Beginning of Period	6	91
CASH AND CASH EQUIVALENTS AT END OF PERIOD	6	7
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid (received) for income taxes, net	$ (21)	$ 4