Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net Income	$ 53us-gaap_NetIncomeLoss	$ 75us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	159	133
Deferred income taxes	49us-gaap_DeferredIncomeTaxExpenseBenefit	525us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of land		(4)us-gaap_GainsLossesOnSalesOfAssets
Other		(4)us-gaap_OtherNoncashIncomeExpense
Changes in:
Accounts receivable	(195)	(41)
Inventories	(7)us-gaap_IncreaseDecreaseInInventories	6us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	(3)	(8)
Regulatory assets and liabilities, net	38	22
Accounts payable and accrued liabilities	9	20
Pension benefit obligation, excluding contributions	20	14
Cash collateral related to derivative activities	2	(4)
Income tax-related prepayments, receivables and payables	(2)	(483)
Interest accrued	28	34
Other assets and liabilities	6
Net current assets held for disposition or sale		(1)us-gaap_GainLossOnDispositionOfAssets1
Net Cash From Operating Activities	157	284
INVESTING ACTIVITIES
Investment in property, plant and equipment	(246)	(282)
Department of Energy capital reimbursement awards received		3pom_ReimbursementOfCapitalExpenditures
Proceeds from sale of land		4
Changes in restricted cash equivalents	9	(13)
Net other investing activities	2	3
Net Cash Used By Investing Activities	(235)	(285)
FINANCING ACTIVITIES
Dividends paid on common stock	(68)us-gaap_PaymentsOfDividendsCommonStock	(68)us-gaap_PaymentsOfDividendsCommonStock
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan and employee-related compensation	8	13
Issuance of Series A preferred stock	18
Issuances of long-term debt	208	400
Reacquisitions of long-term debt	(22)us-gaap_RepaymentsOfLongTermDebt	(10)us-gaap_RepaymentsOfLongTermDebt
Changes in restricted cash equivalents		(175)
Issuances (repayments) of short-term debt, net	74	(56)
Cost of issuances	(4)	(7)
Net other financing activities	(9)	3
Net Cash From (Used by) Financing Activities	205	100
Net Increase in Cash and Cash Equivalents	127	99
Cash and Cash Equivalents at Beginning of Period	14	23
CASH AND CASH EQUIVALENTS AT END OF PERIOD	141	122
SUPPLEMENTAL CASH FLOW INFORMATION
Cash received for income taxes (includes payments from PHI for federal income taxes)	(14)us-gaap_IncomeTaxesPaidNet	(1)us-gaap_IncomeTaxesPaidNet
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net Income	26	32
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	65	56
Deferred income taxes	12	39
Gain on sale of land		(4)
Changes in:
Accounts receivable	(91)	(19)
Inventories	(7)	1
Prepaid expenses		(2)
Regulatory assets and liabilities, net	(3)	(18)
Accounts payable and accrued liabilities	17	(9)
Pension benefit obligation, excluding contributions	7	5
Income tax-related prepayments, receivables and payables	(7)	(34)
Interest accrued	13	18
Other assets and liabilities	1	1
Net Cash From Operating Activities	33	66
INVESTING ACTIVITIES
Investment in property, plant and equipment	(119)	(124)
Department of Energy capital reimbursement awards received		3
Proceeds from sale of land		4
Changes in restricted cash equivalents	3	(5)
Net other investing activities	3	4
Net Cash Used By Investing Activities	(113)	(118)
FINANCING ACTIVITIES
Capital contributions from Parent	112	80
Issuances of long-term debt	208	400
Reacquisitions of long-term debt	(12)
Changes in restricted cash equivalents		(175)
Issuances (repayments) of short-term debt, net	(104)	(151)
Cost of issuances	(4)	(7)
Net other financing activities		1
Net Cash From (Used by) Financing Activities	200	148
Net Increase in Cash and Cash Equivalents	120	96
Cash and Cash Equivalents at Beginning of Period	6	9
CASH AND CASH EQUIVALENTS AT END OF PERIOD	126	105
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	32	37
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	39	30
Deferred income taxes	21	25
Changes in:
Accounts receivable	(72)	(13)
Inventories	1	5
Regulatory assets and liabilities, net	15	(3)
Accounts payable and accrued liabilities	8	2
Income tax-related prepayments, receivables and payables	2	1
Interest accrued	8	7
Other assets and liabilities	3	1
Net Cash From Operating Activities	57	92
INVESTING ACTIVITIES
Investment in property, plant and equipment	(68)	(87)
Changes in restricted cash equivalents	5	(9)
Net other investing activities	2
Net Cash Used By Investing Activities	(61)	(96)
FINANCING ACTIVITIES
Dividends paid on common stock	(62)	(20)
Issuances (repayments) of short-term debt, net	69	31
Net Cash From (Used by) Financing Activities	7	11
Net Increase in Cash and Cash Equivalents	3	7
Cash and Cash Equivalents at Beginning of Period	4	2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	7	9
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	4	10
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	43	38
Deferred income taxes	2	7
Changes in:
Accounts receivable	(37)	(5)
Regulatory assets and liabilities, net	27	42
Accounts payable and accrued liabilities	9	4
Income tax-related prepayments, receivables and payables	7	5
Other assets and liabilities	8	11
Net Cash From Operating Activities	63	112
INVESTING ACTIVITIES
Investment in property, plant and equipment	(54)	(53)
Net other investing activities	1
Net Cash Used By Investing Activities	(53)	(53)
FINANCING ACTIVITIES
Dividends paid on common stock	(12)	(26)
Reacquisitions of long-term debt	(10)	(10)
Issuances (repayments) of short-term debt, net	16	(19)
Net Cash From (Used by) Financing Activities	(6)	(55)
Net Increase in Cash and Cash Equivalents	4	4
Cash and Cash Equivalents at Beginning of Period	2	3
CASH AND CASH EQUIVALENTS AT END OF PERIOD	6	7
SUPPLEMENTAL CASH FLOW INFORMATION
Cash received for income taxes (includes payments from PHI for federal income taxes)

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