Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net Income (Loss)	$ 327	$ 242	$ (212)
(Income) loss from discontinued operations, net of income taxes	(9)		322
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	651	549	473
Deferred income taxes	122	302	458
Gains on sales of land	(46)
Losses on treasury rate locks reclassified into income	1	1	1
Impairment losses		81	4
Increase in fair value of preferred stock derivative	(15)
Other	(2)	(6)	(13)
Changes in:
Accounts receivable	(56)	48	(46)
Inventories		7	5
Prepaid expenses	8	(8)	17
Regulatory assets and liabilities, net	(146)	(216)	(121)
Accounts payable and accrued liabilities	(14)	(22)	1
Pension contributions			(120)
Pension benefit obligation, excluding contributions	76	48	65
Cash collateral related to derivative activities	2	(9)	31
Income tax-related prepayments, receivables and payables	32	(173)	(182)
Advanced payment made to taxing authority			(242)
Other assets and liabilities	8	10	9
Net current assets held for disposition or sale			47
Net Cash From (Used By) Operating Activities	939	854	497
INVESTING ACTIVITIES
Investment in property, plant and equipment	(1,230)	(1,223)	(1,310)
Department of Energy capital reimbursement awards received		4	22
Proceeds from sales of land	54
Changes in restricted cash equivalents	7	(12)	1
Net other investing activities	8	5	3
Proceeds from discontinued operations, early termination of finance leases held in trust			873
Net Cash Used By Investing Activities	(1,161)	(1,226)	(411)
FINANCING ACTIVITIES
Dividends paid on common stock	(275)	(272)	(270)
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan (DRP) and employee-related compensation	18	34	50
Issuances of common stock			324
Issuances of Series A preferred stock	54	126
Issuances of long-term debt	558	766	800
Reacquisitions of long-term debt	(420)	(334)	(558)
Issuances (repayments) of short-term debt, net	34	164	(200)
Borrowings under term loans	300		250
Repayment of term loan		(100)	(450)
Cost of issuances	(7)	(10)	(23)
Net other financing activities	(29)	(11)	(11)
Net Cash From (Used By) Financing Activities	233	363	(88)
Net Increase (Decrease) In Cash and Cash Equivalents	11	(9)	(2)
Cash and Cash Equivalents at Beginning of Year	14	23	25
CASH AND CASH EQUIVALENTS AT END OF YEAR	25	14	23
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	268	257	260
Cash (received) paid for income taxes	(13)	(2)	228
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net Income (Loss)	76	104	89
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	153	125	107
Deferred income taxes	74	111	65
Investment tax credit amortization	(1)	(1)	(1)
Changes in:
Accounts receivable	(9)	15	(7)
Inventories	5	(4)	2
Regulatory assets and liabilities, net	(38)	(66)	(42)
Accounts payable and accrued liabilities	10	(15)	(1)
Pension contributions	0	0	(10)
Pension benefit obligation, excluding contributions	15	8	14
Income tax-related prepayments, receivables and payables	(19)	(3)	(1)
Other assets and liabilities		(6)	(1)
Net Cash From (Used By) Operating Activities	266	268	214
INVESTING ACTIVITIES
Investment in property, plant and equipment	(352)	(352)	(357)
Net other investing activities	7	(6)	2
Net Cash Used By Investing Activities	(345)	(358)	(355)
FINANCING ACTIVITIES
Dividends paid on common stock	(92)	(100)	(30)
Capital contributions from Parent	75	130
Issuances of long-term debt	200	204	300
Reacquisitions of long-term debt	(100)	(100)	(250)
Issuances (repayments) of short-term debt, net	(1)	(41)	115
Cost of issuances	(2)	(2)	(3)
Net other financing activities		1	5
Net Cash From (Used By) Financing Activities	80	92	137
Net Increase (Decrease) In Cash and Cash Equivalents	1	2	(4)
Cash and Cash Equivalents at Beginning of Year	4	2	6
CASH AND CASH EQUIVALENTS AT END OF YEAR	5	4	2
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	47	45	47
Cash (received) paid for income taxes	(5)	(43)	(8)
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net Income (Loss)	38	45	50
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	176	157	136
Deferred income taxes	30	37	53
Investment tax credit amortization			(1)
Changes in:
Accounts receivable	(44)	18	7
Inventories		5	2
Regulatory assets and liabilities, net	21	13	19
Accounts payable and accrued liabilities	12	(13)	(1)
Pension contributions	0	0	(30)
Income tax-related prepayments, receivables and payables	10	(16)	(6)
Other assets and liabilities	13	13	12
Net Cash From (Used By) Operating Activities	256	259	241
INVESTING ACTIVITIES
Investment in property, plant and equipment	(300)	(225)	(261)
Department of Energy capital reimbursement awards received		1	2
Net other investing activities	(6)		3
Net Cash Used By Investing Activities	(306)	(224)	(256)
FINANCING ACTIVITIES
Dividends paid on common stock	(12)	(26)	(60)
Capital contributions from Parent	95		75
Issuances of long-term debt	150	150	100
Reacquisitions of long-term debt	(58)	(48)	(108)
Issuances (repayments) of short-term debt, net	(122)	(11)	6
Repayment of term loan		(100)
Net other financing activities	(2)	(1)	(1)
Net Cash From (Used By) Financing Activities	51	(36)	12
Net Increase (Decrease) In Cash and Cash Equivalents	1	(1)	(3)
Cash and Cash Equivalents at Beginning of Year	2	3	6
CASH AND CASH EQUIVALENTS AT END OF YEAR	3	2	3
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	63	61	67
Cash (received) paid for income taxes		(3)	(21)
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net Income (Loss)	187	171	150
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	277	229	196
Deferred income taxes	149	174	120
Gains on sales of land	(46)
Investment tax credit amortization			(1)
Other		(9)
Changes in:
Accounts receivable	(32)	27	(39)
Inventories	(5)	5	2
Prepaid expenses	2	(2)	(1)
Regulatory assets and liabilities, net	(129)	(163)	(99)
Accounts payable and accrued liabilities	(19)	(34)	26
Pension contributions	0	0	0
Pension benefit obligation, excluding contributions	24	16	21
Income tax-related prepayments, receivables and payables	(40)	(25)	(36)
Interest accrued	2		2
Other assets and liabilities	3	(3)	(11)
Net Cash From (Used By) Operating Activities	373	386	330
INVESTING ACTIVITIES
Investment in property, plant and equipment	(544)	(567)	(576)
Department of Energy capital reimbursement awards received		3	20
Proceeds from sales of land	54
Changes in restricted cash equivalents	3	(3)	(3)
Net other investing activities	10	7	(5)
Net Cash Used By Investing Activities	(477)	(560)	(564)
FINANCING ACTIVITIES
Dividends paid on common stock	(146)	(86)	(46)
Capital contributions from Parent	112	80	175
Issuances of long-term debt	208	412	400
Reacquisitions of long-term debt	(12)	(175)	(200)
Issuances (repayments) of short-term debt, net	(40)	(47)	(80)
Cost of issuances	(4)	(7)	(7)
Net other financing activities	(15)	(6)	(8)
Net Cash From (Used By) Financing Activities	103	171	234
Net Increase (Decrease) In Cash and Cash Equivalents	(1)	(3)
Cash and Cash Equivalents at Beginning of Year	6	9	9
CASH AND CASH EQUIVALENTS AT END OF YEAR	5	6	9
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	116	111	102
Cash (received) paid for income taxes	$ (6)	$ (58)	$ (28)