Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
Net Income (Loss)	$ 75	$ (430)
Loss from discontinued operations		319
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	133	112
Deferred income taxes	525	(496)
Gain on sale of assets	(4)
Other	(4)	(3)
Changes in:
Accounts receivable	(41)	(14)
Inventories	6	3
Prepaid expenses	(8)	(1)
Regulatory assets and liabilities, net	22	(6)
Accounts payable and accrued liabilities	20	(90)
Pension contributions		(60)
Pension benefit obligation, excluding contributions	14	14
Cash collateral related to derivative activities	(4)	17
Income tax-related prepayments, receivables and payables	(483)	604
Advanced payment made to taxing authority		(242)
Interest accrued	34	37
Other assets and liabilities		(4)
Net current assets held for disposition or sale	(1)	64
Net Cash From (Used By) Operating Activities	284	(176)
INVESTING ACTIVITIES
Investment in property, plant and equipment	(282)	(296)
Department of Energy capital reimbursement awards received	3	1
Proceeds from sale of assets	4
Changes in restricted cash equivalents	(13)	2
Net other investing activities	3	(3)
Net Cash Used By Investing Activities	(285)	(296)
FINANCING ACTIVITIES
Dividends paid on common stock	(68)	(67)
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan and employee-related compensation	13	15
Issuances of common stock		324
Issuance of long-term debt	400	250
Reacquisitions of long-term debt	(10)	(10)
Changes in restricted cash equivalents	(175)
(Repayments) issuances of short-term debt, net	(56)	26
Issuance of term loan		250
Repayment of term loan		(200)
Cost of issuances	(7)	(16)
Net other financing activities	3
Net Cash From Financing Activities	100	572
Net (Decrease) Increase in Cash and Cash Equivalents	99	100
Cash and Cash Equivalents at Beginning of Period	23	25
CASH AND CASH EQUIVALENTS AT END OF PERIOD	122	125
SUPPLEMENTAL CASH FLOW INFORMATION
Cash received for income taxes (includes payments from PHI for federal income taxes)	(1)	(1)
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net Income (Loss)	32	23
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	56	47
Deferred income taxes	39	26
Gain on sale of assets	(4)
Changes in:
Accounts receivable	(19)	(2)
Inventories	1	(2)
Prepaid expenses	(2)	3
Regulatory assets and liabilities, net	(18)	(9)
Accounts payable and accrued liabilities	(9)	(27)
Pension benefit obligation, excluding contributions	5	4
Income tax-related prepayments, receivables and payables	(34)	(60)
Interest accrued	18	21
Other assets and liabilities	1
Net Cash From (Used By) Operating Activities	66	24
INVESTING ACTIVITIES
Investment in property, plant and equipment	(124)	(125)
Department of Energy capital reimbursement awards received	3	1
Proceeds from sale of assets	4
Changes in restricted cash equivalents	(5)
Net other investing activities	4	(3)
Net Cash Used By Investing Activities	(118)	(127)
FINANCING ACTIVITIES
Capital contribution from Parent	80	175
Issuance of long-term debt	400	250
Changes in restricted cash equivalents	(175)
(Repayments) issuances of short-term debt, net	(151)	(231)
Cost of issuances	(7)	(4)
Net other financing activities	1	1
Net Cash From Financing Activities	148	191
Net (Decrease) Increase in Cash and Cash Equivalents	96	88
Cash and Cash Equivalents at Beginning of Period	9	9
CASH AND CASH EQUIVALENTS AT END OF PERIOD	105	97
SUPPLEMENTAL CASH FLOW INFORMATION
Cash received for income taxes (includes payments from PHI for federal income taxes)	(2)
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net Income (Loss)	37	26
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	30	25
Deferred income taxes	25	17
Changes in:
Accounts receivable	(13)	(16)
Inventories	5	5
Regulatory assets and liabilities, net	(3)	5
Accounts payable and accrued liabilities	2	(15)
Pension contributions	0	(10)
Income tax-related prepayments, receivables and payables	1	1
Interest accrued	7	9
Other assets and liabilities	1	1
Net Cash From (Used By) Operating Activities	92	48
INVESTING ACTIVITIES
Investment in property, plant and equipment	(87)	(83)
Changes in restricted cash equivalents	(9)
Net other investing activities		1
Net Cash Used By Investing Activities	(96)	(82)
FINANCING ACTIVITIES
Dividends paid on common stock	(20)
(Repayments) issuances of short-term debt, net	31	38
Net Cash From Financing Activities	11	38
Net (Decrease) Increase in Cash and Cash Equivalents	7	4
Cash and Cash Equivalents at Beginning of Period	2	6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	9	10
SUPPLEMENTAL CASH FLOW INFORMATION
Cash received for income taxes (includes payments from PHI for federal income taxes)
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net Income (Loss)	10	9
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	38	31
Deferred income taxes	7	2
Changes in:
Accounts receivable	(5)	1
Regulatory assets and liabilities, net	42	(1)
Accounts payable and accrued liabilities	4	(8)
Pension contributions	0	(30)
Income tax-related prepayments, receivables and payables	5	3
Other assets and liabilities	11	8
Net Cash From (Used By) Operating Activities	112	15
INVESTING ACTIVITIES
Investment in property, plant and equipment	(53)	(74)
Net other investing activities		(2)
Net Cash Used By Investing Activities	(53)	(76)
FINANCING ACTIVITIES
Dividends paid on common stock	(26)
Reacquisitions of long-term debt	(10)	(10)
(Repayments) issuances of short-term debt, net	(19)	75
Net Cash From Financing Activities	(55)	65
Net (Decrease) Increase in Cash and Cash Equivalents	4	4
Cash and Cash Equivalents at Beginning of Period	3	6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	7	10
SUPPLEMENTAL CASH FLOW INFORMATION
Cash received for income taxes (includes payments from PHI for federal income taxes)