Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net Income	$ 197	$ 207
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	494	410
Deferred income taxes	109	259
Gains on sales of land		(9)
Impairment loss		53
Increase in fair value of preferred stock derivative	(15)
Other	(2)	4
Changes in:
Accounts receivable	(165)	18
Inventories	(1)	(4)
Prepaid expenses	(7)	(27)
Regulatory assets and liabilities, net	(99)	(135)
Accounts payable and accrued liabilities	(12)	39
Pension benefit obligation, excluding contributions	56	36
Cash collateral related to derivative activities	4	(6)
Income tax-related prepayments, receivables and payables	11	(138)
Interest accrued	29	33
Other assets and liabilities	2	9
Net Cash From Operating Activities	601	749
INVESTING ACTIVITIES
Investment in property, plant and equipment	(855)	(846)
Department of Energy capital reimbursement awards received		4
Proceeds from sales of land		9
Changes in restricted cash equivalents	6	(7)
Net other investing activities	14	(4)
Net Cash Used By Investing Activities	(835)	(844)
FINANCING ACTIVITIES
Dividends paid on common stock	(206)	(204)
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan and employee-related compensation	23	29
Issuance of Series A preferred stock	54	108
Issuances of long-term debt	408	771
Reacquisitions of long-term debt	(158)	(232)
Issuances (repayments) of short-term debt, net	99	(32)
Borrowings under term loan	300
Repayment of term loan		(100)
Cost of issuances	(6)	(10)
Net other financing activities	(23)	(1)
Net Cash From (Used by) Financing Activities	491	329
Net Increase in Cash and Cash Equivalents	257	234
Cash and Cash Equivalents at Beginning of Period	14	23
CASH AND CASH EQUIVALENTS AT END OF PERIOD	271	257
SUPPLEMENTAL CASH FLOW INFORMATION
Cash (received) paid for income taxes (includes payments from PHI for federal income taxes)	(12)	(1)
Delmarva Power & Light Co/De [Member]
OPERATING ACTIVITIES
Net Income	55	79
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	117	93
Deferred income taxes	40	94
Changes in:
Accounts receivable	(15)	43
Inventories	9	(9)
Regulatory assets and liabilities, net	(34)	(47)
Accounts payable and accrued liabilities	(5)	1
Income tax-related prepayments, receivables and payables	3	2
Interest accrued	9	10
Other assets and liabilities	9	1
Net Cash From Operating Activities	188	267
INVESTING ACTIVITIES
Investment in property, plant and equipment	(246)	(251)
Changes in restricted cash equivalents	5	(5)
Net other investing activities	1	(1)
Net Cash Used By Investing Activities	(240)	(257)
FINANCING ACTIVITIES
Dividends paid on common stock	(80)	(20)
Capital contributions from Parent	75	130
Issuances of long-term debt	200	204
Reacquisitions of long-term debt	(100)
Issuances (repayments) of short-term debt, net	(40)	(147)
Cost of issuances	(2)	(2)
Net other financing activities		1
Net Cash From (Used by) Financing Activities	53	166
Net Increase in Cash and Cash Equivalents	1	176
Cash and Cash Equivalents at Beginning of Period	4	2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	5	178
SUPPLEMENTAL CASH FLOW INFORMATION
Cash (received) paid for income taxes (includes payments from PHI for federal income taxes)	(5)	(43)
Atlantic City Electric Co [Member]
OPERATING ACTIVITIES
Net Income	28	39
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	135	117
Deferred income taxes	7	28
Changes in:
Accounts receivable	(68)	(10)
Inventories	(3)	2
Prepaid expenses	(7)	(15)
Regulatory assets and liabilities, net	26	26
Accounts payable and accrued liabilities	33	11
Income tax-related prepayments, receivables and payables	13	(1)
Other assets and liabilities	14	18
Net Cash From Operating Activities	178	215
INVESTING ACTIVITIES
Investment in property, plant and equipment	(212)	(158)
Department of Energy capital reimbursement awards received		1
Net other investing activities	(4)	(3)
Net Cash Used By Investing Activities	(216)	(160)
FINANCING ACTIVITIES
Dividends paid on common stock	(12)	(26)
Issuances of long-term debt		150
Reacquisitions of long-term debt	(46)	(36)
Issuances (repayments) of short-term debt, net	98	(39)
Repayment of term loan		(100)
Net other financing activities		(1)
Net Cash From (Used by) Financing Activities	40	(52)
Net Increase in Cash and Cash Equivalents	2	3
Cash and Cash Equivalents at Beginning of Period	2	3
CASH AND CASH EQUIVALENTS AT END OF PERIOD	4	6
SUPPLEMENTAL CASH FLOW INFORMATION
Cash (received) paid for income taxes (includes payments from PHI for federal income taxes)		(3)
Potomac Electric Power Co [Member]
OPERATING ACTIVITIES
Net Income	128	145
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	207	171
Deferred income taxes	69	161
Gains on sales of land		(9)
Changes in:
Accounts receivable	(103)	(8)
Inventories	(5)	2
Prepaid expenses	(3)	(3)
Regulatory assets and liabilities, net	(90)	(112)
Accounts payable and accrued liabilities	(17)	(16)
Pension benefit obligation, excluding contributions	18	12
Income tax-related prepayments, receivables and payables	(4)	(30)
Interest accrued	13	15
Other assets and liabilities		(3)
Net Cash From Operating Activities	213	325
INVESTING ACTIVITIES
Investment in property, plant and equipment	(374)	(380)
Department of Energy capital reimbursement awards received		3
Proceeds from sales of land		9
Changes in restricted cash equivalents	3
Net other investing activities	14	(4)
Net Cash Used By Investing Activities	(357)	(372)
FINANCING ACTIVITIES
Dividends paid on common stock	(91)	(46)
Capital contributions from Parent	112	80
Issuances of long-term debt	208	410
Reacquisitions of long-term debt	(12)	(175)
Issuances (repayments) of short-term debt, net	(56)	(151)
Cost of issuances	(4)	(7)
Net other financing activities	(9)	(1)
Net Cash From (Used by) Financing Activities	148	110
Net Increase in Cash and Cash Equivalents	4	63
Cash and Cash Equivalents at Beginning of Period	6	9
CASH AND CASH EQUIVALENTS AT END OF PERIOD	10	72
SUPPLEMENTAL CASH FLOW INFORMATION
Cash (received) paid for income taxes (includes payments from PHI for federal income taxes)	$ (6)	$ (58)