Consolidated Statements of Cash Flows (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net Income (loss)	$ 242,000,000us-gaap_NetIncomeLoss	$ (212,000,000)us-gaap_NetIncomeLoss	$ 285,000,000us-gaap_NetIncomeLoss
Loss (income) from discontinued operations, net of income taxes		322,000,000	(67,000,000)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	549,000,000	473,000,000	454,000,000
Deferred income taxes	302,000,000us-gaap_DeferredIncomeTaxExpenseBenefit	458,000,000us-gaap_DeferredIncomeTaxExpenseBenefit	312,000,000us-gaap_DeferredIncomeTaxExpenseBenefit
Gains on sales of land	(9,000,000)us-gaap_GainsLossesOnSalesOfAssets
Losses on treasury rate locks reclassified into income	1,000,000	1,000,000
Impairment losses	81,000,000us-gaap_AssetImpairmentCharges	4,000,000us-gaap_AssetImpairmentCharges	12,000,000us-gaap_AssetImpairmentCharges
Other	3,000,000us-gaap_OtherNoncashIncomeExpense	(13,000,000)us-gaap_OtherNoncashIncomeExpense	(15,000,000)us-gaap_OtherNoncashIncomeExpense
Changes in:
Accounts receivable	48,000,000	(46,000,000)	(2,000,000)
Inventories	7,000,000us-gaap_IncreaseDecreaseInInventories	5,000,000us-gaap_IncreaseDecreaseInInventories	(28,000,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	(8,000,000)	17,000,000	(12,000,000)
Regulatory assets and liabilities, net	(216,000,000)	(121,000,000)	(174,000,000)
Accounts payable and accrued liabilities	(22,000,000)	1,000,000	43,000,000
Pension contributions		(120,000,000)us-gaap_PensionContributions	(200,000,000)us-gaap_PensionContributions
Pension benefit obligation, excluding contributions	48,000,000	65,000,000	65,000,000
Cash collateral related to derivative activities	(9,000,000)	31,000,000	88,000,000
Income tax-related prepayments, receivables and payables	(173,000,000)	(182,000,000)	(160,000,000)
Advanced payment made to taxing authority		(242,000,000)us-gaap_IncreaseDecreaseInPrepaidTaxes
Other assets and liabilities	10,000,000	9,000,000	16,000,000
Net current assets held for disposition or sale		47,000,000	(25,000,000)
Net Cash From Operating Activities	854,000,000	497,000,000	592,000,000
INVESTING ACTIVITIES
Investment in property, plant and equipment	(1,223,000,000)	(1,310,000,000)	(1,216,000,000)
Department of Energy capital reimbursement awards received	4,000,000pom_ReimbursementOfCapitalExpenditures	22,000,000pom_ReimbursementOfCapitalExpenditures	40,000,000pom_ReimbursementOfCapitalExpenditures
Proceeds from sales of land	9,000,000
Changes in restricted cash equivalents	(12,000,000)	1,000,000	(1,000,000)
Net other investing activities	(4,000,000)	3,000,000	6,000,000
Proceeds from discontinued operations, early termination of finance leases held in trust		873,000,000	202,000,000
Net Cash Used By Investing Activities	(1,226,000,000)	(411,000,000)	(969,000,000)
FINANCING ACTIVITIES
Dividends paid on common stock	(272,000,000)us-gaap_PaymentsOfDividendsCommonStock	(270,000,000)us-gaap_PaymentsOfDividendsCommonStock	(248,000,000)us-gaap_PaymentsOfDividendsCommonStock
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan (DRP) and employee-related compensation	34,000,000	50,000,000	51,000,000
Issuances of common stock		324,000,000
Issuances of Series A preferred stock	126,000,000
Issuances of long-term debt	766,000,000	800,000,000	450,000,000
Reacquisitions of long-term debt	(334,000,000)us-gaap_RepaymentsOfLongTermDebt	(558,000,000)us-gaap_RepaymentsOfLongTermDebt	(176,000,000)us-gaap_RepaymentsOfLongTermDebt
Issuances (repayments) of short-term debt, net	164,000,000	(200,000,000)	33,000,000
Issuances of term loans		250,000,000us-gaap_ProceedsFromOtherDebt	200,000,000us-gaap_ProceedsFromOtherDebt
Repayments of term loans	(100,000,000)us-gaap_RepaymentsOfOtherDebt	(450,000,000)us-gaap_RepaymentsOfOtherDebt
Cost of issuances	(10,000,000)	(23,000,000)	(9,000,000)
Net other financing activities	(11,000,000)	(11,000,000)	(8,000,000)
Net Cash From (Used By) Financing Activities	363,000,000	(88,000,000)	293,000,000
Net Increase (Decrease) In Cash and Cash Equivalents	(9,000,000)	(2,000,000)	(84,000,000)
Cash and Cash Equivalents at Beginning of Year	23,000,000	25,000,000	109,000,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	14,000,000	23,000,000	25,000,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	257,000,000us-gaap_InterestPaidNet	260,000,000us-gaap_InterestPaidNet	253,000,000us-gaap_InterestPaidNet
Cash (received) paid for income taxes (includes payments to (from) PHI for Federal income taxes)	(2,000,000)us-gaap_IncomeTaxesPaidNet	228,000,000us-gaap_IncomeTaxesPaidNet
Non-cash activities:
Reclassification of property, plant and equipment to regulatory assets			88,000,000
Reclassification of asset removal costs regulatory liability to accumulated depreciation			61,000,000
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net Income (loss)	171,000,000	150,000,000	126,000,000
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	229,000,000	196,000,000	190,000,000
Deferred income taxes	174,000,000	120,000,000	160,000,000
Gains on sales of land	(9,000,000)
Investment tax credit amortization		(1,000,000)	(1,000,000)
Changes in:
Accounts receivable	27,000,000	(39,000,000)	22,000,000
Inventories	5,000,000	2,000,000	(19,000,000)
Prepaid expenses	(2,000,000)	(1,000,000)	6,000,000
Regulatory assets and liabilities, net	(163,000,000)	(99,000,000)	(110,000,000)
Accounts payable and accrued liabilities	(34,000,000)	26,000,000	(10,000,000)
Pension contributions	0	0	(85,000,000)
Pension benefit obligation, excluding contributions	16,000,000	21,000,000	21,000,000
Income tax-related prepayments, receivables and payables	(25,000,000)	(36,000,000)	(69,000,000)
Interest accrued		2,000,000
Other assets and liabilities	(3,000,000)	(11,000,000)	(8,000,000)
Net Cash From Operating Activities	386,000,000	330,000,000	223,000,000
INVESTING ACTIVITIES
Investment in property, plant and equipment	(567,000,000)	(576,000,000)	(592,000,000)
Department of Energy capital reimbursement awards received	3,000,000	20,000,000	38,000,000
Proceeds from sales of land	9,000,000
Changes in restricted cash equivalents	(3,000,000)	(3,000,000)
Net other investing activities	(2,000,000)	(5,000,000)	4,000,000
Net Cash Used By Investing Activities	(560,000,000)	(564,000,000)	(550,000,000)
FINANCING ACTIVITIES
Dividends paid on common stock	(86,000,000)	(46,000,000)	(35,000,000)
Capital contributions from Parent	80,000,000	175,000,000	50,000,000
Issuances of long-term debt	412,000,000	400,000,000	200,000,000
Reacquisitions of long-term debt	(175,000,000)	(200,000,000)	(38,000,000)
Issuances (repayments) of short-term debt, net	(47,000,000)	(80,000,000)	157,000,000
Cost of issuances	(7,000,000)	(7,000,000)	(4,000,000)
Net other financing activities	(6,000,000)	(8,000,000)	(6,000,000)
Net Cash From (Used By) Financing Activities	171,000,000	234,000,000	324,000,000
Net Increase (Decrease) In Cash and Cash Equivalents	(3,000,000)		(3,000,000)
Cash and Cash Equivalents at Beginning of Year	9,000,000	9,000,000	12,000,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	6,000,000	9,000,000	9,000,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	111,000,000	102,000,000	97,000,000
Cash (received) paid for income taxes (includes payments to (from) PHI for Federal income taxes)	(58,000,000)	(28,000,000)	(40,000,000)
Non-cash activities:
Reclassification of property, plant and equipment to regulatory assets			50,000,000
Reclassification of asset removal costs regulatory liability to accumulated depreciation			19,000,000
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net Income (loss)	104,000,000	89,000,000	73,000,000
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	125,000,000	107,000,000	102,000,000
Deferred income taxes	111,000,000	65,000,000	55,000,000
Investment tax credit amortization	(1,000,000)	(1,000,000)	(1,000,000)
Changes in:
Accounts receivable	15,000,000	(7,000,000)	(15,000,000)
Inventories	(4,000,000)	2,000,000	(9,000,000)
Regulatory assets and liabilities, net	(66,000,000)	(42,000,000)	(29,000,000)
Accounts payable and accrued liabilities	(15,000,000)	(1,000,000)	26,000,000
Pension contributions	0	(10,000,000)	(85,000,000)
Pension benefit obligation, excluding contributions	8,000,000	14,000,000	15,000,000
Income tax-related prepayments, receivables and payables	(3,000,000)	(1,000,000)	8,000,000
Other assets and liabilities	(6,000,000)	(1,000,000)	(9,000,000)
Net Cash From Operating Activities	268,000,000	214,000,000	131,000,000
INVESTING ACTIVITIES
Investment in property, plant and equipment	(352,000,000)	(357,000,000)	(320,000,000)
Net other investing activities	(6,000,000)	2,000,000
Net Cash Used By Investing Activities	(358,000,000)	(355,000,000)	(320,000,000)
FINANCING ACTIVITIES
Dividends paid on common stock	(100,000,000)	(30,000,000)
Capital contributions from Parent	130,000,000		60,000,000
Issuances of long-term debt	204,000,000	300,000,000	250,000,000
Reacquisitions of long-term debt	(100,000,000)	(250,000,000)	(97,000,000)
Issuances (repayments) of short-term debt, net	(41,000,000)	115,000,000	(15,000,000)
Cost of issuances	(2,000,000)	(3,000,000)	(3,000,000)
Net other financing activities	1,000,000	5,000,000	(5,000,000)
Net Cash From (Used By) Financing Activities	92,000,000	137,000,000	190,000,000
Net Increase (Decrease) In Cash and Cash Equivalents	2,000,000	(4,000,000)	1,000,000
Cash and Cash Equivalents at Beginning of Year	2,000,000	6,000,000	5,000,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	4,000,000	2,000,000	6,000,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	45,000,000	47,000,000	44,000,000
Cash (received) paid for income taxes (includes payments to (from) PHI for Federal income taxes)	(43,000,000)	(8,000,000)	(24,000,000)
Non-cash activities:
Reclassification of property, plant and equipment to regulatory assets			38,000,000
Reclassification of asset removal costs regulatory liability to accumulated depreciation			42,000,000
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net Income (loss)	45,000,000	50,000,000	35,000,000
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	157,000,000	136,000,000	124,000,000
Deferred income taxes	37,000,000	53,000,000	62,000,000
Investment tax credit amortization		(1,000,000)	(1,000,000)
Changes in:
Accounts receivable	18,000,000	7,000,000	(7,000,000)
Inventories	5,000,000	2,000,000	(5,000,000)
Regulatory assets and liabilities, net	13,000,000	19,000,000	(33,000,000)
Accounts payable and accrued liabilities	(13,000,000)	(1,000,000)	15,000,000
Pension contributions	0	(30,000,000)	(30,000,000)
Income tax-related prepayments, receivables and payables	(16,000,000)	(6,000,000)	(43,000,000)
Other assets and liabilities	13,000,000	12,000,000	19,000,000
Net Cash From Operating Activities	259,000,000	241,000,000	136,000,000
INVESTING ACTIVITIES
Investment in property, plant and equipment	(225,000,000)	(261,000,000)	(256,000,000)
Department of Energy capital reimbursement awards received	1,000,000	2,000,000	2,000,000
Net other investing activities		3,000,000	(1,000,000)
Net Cash Used By Investing Activities	(224,000,000)	(256,000,000)	(255,000,000)
FINANCING ACTIVITIES
Dividends paid on common stock	(26,000,000)	(60,000,000)	(35,000,000)
Capital contributions from Parent		75,000,000
Issuances of long-term debt	150,000,000	100,000,000
Reacquisitions of long-term debt	(48,000,000)	(108,000,000)	(41,000,000)
Issuances (repayments) of short-term debt, net	(11,000,000)	6,000,000	110,000,000
Repayments of term loans	(100,000,000)
Net other financing activities	(1,000,000)	(1,000,000)
Net Cash From (Used By) Financing Activities	(36,000,000)	12,000,000	34,000,000
Net Increase (Decrease) In Cash and Cash Equivalents	(1,000,000)	(3,000,000)	(85,000,000)
Cash and Cash Equivalents at Beginning of Year	3,000,000	6,000,000	91,000,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	2,000,000	3,000,000	6,000,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	61,000,000	67,000,000	68,000,000
Cash (received) paid for income taxes (includes payments to (from) PHI for Federal income taxes)	$ (3,000,000)	$ (21,000,000)	$ 1,000,000

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