Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES
Net (loss) income	$ (212)	$ 285	$ 257
Loss (income) from discontinued operations, net of income taxes	322	(67)	(35)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	473	454	425
Deferred income taxes	458	312	178
Losses on treasury rate locks reclassified into income	1		1
Investment tax credit amortization	(2)	(3)	(4)
Impairment losses	4	12
Other	(13)	(15)	(16)
Changes in:
Accounts receivable	(46)	(2)	56
Inventories	5	(28)	(8)
Prepaid expenses	17	(12)	(4)
Regulatory assets and liabilities, net	(121)	(174)	(148)
Accounts payable and accrued liabilities	1	43	(53)
Pension contributions	(120)	(200)	(110)
Pension benefit obligation, excluding contributions	65	65	53
Cash collateral related to derivative activities	31	88	9
Income tax-related prepayments, receivables and payables	(182)	(160)	(27)
Advanced payment made to taxing authority	(242)
Other assets and liabilities	9	16	43
Net current assets held for disposition or sale	47	(25)	65
Net Cash From Operating Activities	497	592	686
INVESTING ACTIVITIES
Investment in property, plant and equipment	(1,310)	(1,216)	(941)
Department of Energy capital reimbursement awards received	22	40	52
Changes in restricted cash equivalents	1	(1)	(10)
Net other investing activities	3	6	(9)
Proceeds from disposal of assets held for disposition	873	202	161
Net Cash Used By Investing Activities	(411)	(969)	(747)
FINANCING ACTIVITIES
Dividends paid on common stock	(270)	(248)	(244)
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan and employee-related compensation	50	51	47
Issuances of common stock	324
Redemption of preferred stock of subsidiaries			(6)
Issuances of long-term debt	800	450	235
Reacquisitions of long-term debt	(558)	(176)	(70)
(Repayments) issuances of short-term debt, net	(200)	33	198
Issuances of term loans	250	200
Repayments of term loans	(450)
Cost of issuances	(23)	(9)	(10)
Net other financing activities	(11)	(8)	(1)
Net Cash (Used By) From Financing Activities	(88)	293	149
Net (Decrease) Increase In Cash and Cash Equivalents	(2)	(84)	88
Cash and Cash Equivalents at Beginning of Year	25	109	21
CASH AND CASH EQUIVALENTS AT END OF YEAR	23	25	109
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	260	253	240
Cash (received) paid for income taxes	228		4
Non-cash activities:
Reclassification of property, plant and equipment to regulatory assets		88
Reclassification of asset removal costs regulatory liability to accumulated depreciation		61
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net (loss) income	150	126	99
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	196	190	171
Deferred income taxes	120	160	73
Investment tax credit amortization	(1)	(1)	(2)
Changes in:
Accounts receivable	(39)	22	33
Inventories	2	(19)	(6)
Prepaid expenses	(1)	6	1
Regulatory assets and liabilities, net	(99)	(110)	(43)
Accounts payable and accrued liabilities	26	(10)	(27)
Pension contributions	0	(85)	(40)
Pension benefit obligation, excluding contributions	21	21	24
Income tax-related prepayments, receivables and payables	(36)	(69)	73
Interest accrued	2		(1)
Other assets and liabilities	(11)	(8)	2
Net Cash From Operating Activities	330	223	357
INVESTING ACTIVITIES
Investment in property, plant and equipment	(576)	(592)	(521)
Department of Energy capital reimbursement awards received	20	38	48
Changes in restricted cash equivalents	(3)
Net other investing activities	(5)	4	(7)
Net Cash Used By Investing Activities	(564)	(550)	(480)
FINANCING ACTIVITIES
Dividends paid on common stock	(46)	(35)	(25)
Capital contributions from Parent	175	50
Issuances of long-term debt	400	200
Reacquisitions of long-term debt	(200)	(38)
(Repayments) issuances of short-term debt, net	(80)	157	74
Cost of issuances	(7)	(4)
Net other financing activities	(8)	(6)	(2)
Net Cash (Used By) From Financing Activities	234	324	47
Net (Decrease) Increase In Cash and Cash Equivalents		(3)	(76)
Cash and Cash Equivalents at Beginning of Year	9	12	88
CASH AND CASH EQUIVALENTS AT END OF YEAR	9	9	12
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	102	97	91
Cash (received) paid for income taxes	(28)	(40)	(108)
Non-cash activities:
Reclassification of property, plant and equipment to regulatory assets		50
Reclassification of asset removal costs regulatory liability to accumulated depreciation		19
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net (loss) income	89	73	71
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	107	102	89
Deferred income taxes	65	55	57
Investment tax credit amortization	(1)	(1)	(1)
Changes in:
Accounts receivable	(7)	(15)	26
Inventories	2	(9)	(3)
Regulatory assets and liabilities, net	(42)	(29)	(30)
Accounts payable and accrued liabilities	(1)	26	(23)
Pension contributions	(10)	(85)	(40)
Pension benefit obligation, excluding contributions	14	15	17
Income tax-related prepayments, receivables and payables	(1)	8	14
Other assets and liabilities	(1)	(9)	1
Net Cash From Operating Activities	214	131	178
INVESTING ACTIVITIES
Investment in property, plant and equipment	(357)	(320)	(229)
Net other investing activities	2		(4)
Net Cash Used By Investing Activities	(355)	(320)	(233)
FINANCING ACTIVITIES
Dividends paid on common stock	(30)		(60)
Capital contributions from Parent		60
Issuances of long-term debt	300	250	35
Reacquisitions of long-term debt	(250)	(97)	(35)
(Repayments) issuances of short-term debt, net	115	(15)	47
Cost of issuances	(3)	(3)
Net other financing activities	5	(5)	4
Net Cash (Used By) From Financing Activities	137	190	(9)
Net (Decrease) Increase In Cash and Cash Equivalents	(4)	1	(64)
Cash and Cash Equivalents at Beginning of Year	6	5	69
CASH AND CASH EQUIVALENTS AT END OF YEAR	2	6	5
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	47	44	43
Cash (received) paid for income taxes	(8)	(24)	(24)
Non-cash activities:
Reclassification of property, plant and equipment to regulatory assets		38
Reclassification of asset removal costs regulatory liability to accumulated depreciation		42
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net (loss) income	50	35	39
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	136	124	134
Deferred income taxes	53	62	42
Investment tax credit amortization	(1)	(1)	(1)
Changes in:
Accounts receivable	7	(7)	26
Inventories	2	(5)	(8)
Regulatory assets and liabilities, net	19	(33)	(74)
Accounts payable and accrued liabilities	4	12	(18)
Pension contributions	(30)	(30)	(30)
Income tax-related prepayments, receivables and payables	(6)	(43)	45
Other assets and liabilities	12	19	16
Net Cash From Operating Activities	246	133	171
INVESTING ACTIVITIES
Investment in property, plant and equipment	(261)	(256)	(138)
Department of Energy capital reimbursement awards received	2	2	4
Net other investing activities	3	(1)	(9)
Net Cash Used By Investing Activities	(256)	(255)	(143)
FINANCING ACTIVITIES
Dividends paid on common stock	(60)	(35)
Capital contributions from Parent	75		60
Redemption of preferred stock of subsidiaries			(6)
Issuances of long-term debt	100		200
Reacquisitions of long-term debt	(108)	(41)	(35)
(Repayments) issuances of short-term debt, net	6	110	(158)
Net other financing activities	(6)	3	(2)
Net Cash (Used By) From Financing Activities	7	37	59
Net (Decrease) Increase In Cash and Cash Equivalents	(3)	(85)	87
Cash and Cash Equivalents at Beginning of Year	6	91	4
CASH AND CASH EQUIVALENTS AT END OF YEAR	3	6	91
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	67	68	64
Cash (received) paid for income taxes	$ (21)	$ 1	$ (51)