Consolidated Balance Sheets (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
CURRENT ASSETS
Cash and cash equivalents	$ 58	$ 20
Restricted cash equivalents	11	11
Accounts receivable, less allowance for uncollectible accounts	958	1,027
Inventories	130	126
Derivative assets	22	45
Prepayments of income taxes	98	276
Deferred income tax assets, net	89	90
Prepaid expenses and other	128	51
Conectiv Energy assets held for sale	4	111
Total Current Assets	1,498	1,757
INVESTMENTS AND OTHER ASSETS
Goodwill	1,407	1,407
Regulatory assets	1,848	1,915
Investment in finance leases held in trust	1,329	1,423
Income taxes receivable	89	114
Restricted cash equivalents	9	5
Assets and accrued interest related to uncertain tax positions	9	11
Other	170	169
Conectiv Energy assets held for sale	1	6
Total Investments and Other Assets	4,862	5,050
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	12,431	12,120
Accumulated depreciation	(4,553)	(4,447)
Net Property, Plant and Equipment	7,878	7,673
TOTAL ASSETS	14,238	14,480
CURRENT LIABILITIES
Short-term debt	395	534
Current portion of long-term debt and project funding	111	75
Accounts payable and accrued liabilities	553	587
Capital lease obligations due within one year	8	8
Taxes accrued	143	96
Interest accrued	47	45
Liabilities and accrued interest related to uncertain tax positions	3	3
Derivative liabilities	47	66
Other	254	321
Liabilities associated with Conectiv Energy assets held for sale	3	62
Total Current Liabilities	1,564	1,797
DEFERRED CREDITS
Regulatory liabilities	525	528
Deferred income taxes, net	2,749	2,714
Investment tax credits	23	26
Pension benefit obligation	214	332
Other postretirement benefit obligations	412	429
Income taxes payable		2
Liabilities and accrued interest related to uncertain tax positions	41	148
Derivative liabilities	9	21
Other	180	175
Liabilities associated with Conectiv Energy assets held for sale		10
Total Deferred Credits	4,153	4,385
LONG-TERM LIABILITIES
Long-term debt	3,795	3,629
Transition bonds issued by ACE Funding	314	332
Long-term project funding	14	15
Capital lease obligations	82	86
Total Long-Term Liabilities	4,205	4,062
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	2	2
Premium on stock and other capital contributions	3,299	3,275
Accumulated other comprehensive loss	(80)	(106)
Retained earnings	1,095	1,059
Total Shareholders' Equity	4,316	4,230
Non-controlling interest		6
Total Equity	4,316	4,236
TOTAL LIABILITIES AND EQUITY	14,238	14,480
Potomac Electric Power Co [Member]
CURRENT ASSETS
Cash and cash equivalents	58	88
Accounts receivable, less allowance for uncollectible accounts	378	373
Inventories	51	44
Prepayments of income taxes	27	95
Income taxes receivable	35	37
Prepaid expenses and other	51	34
Total Current Assets	600	671
INVESTMENTS AND OTHER ASSETS
Regulatory assets	223	191
Prepaid pension expense	305	274
Investment in trust	29	25
Income taxes receivable	25	34
Other	57	57
Total Investments and Other Assets	639	581
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	6,353	6,185
Accumulated depreciation	(2,666)	(2,609)
Net Property, Plant and Equipment	3,687	3,576
TOTAL ASSETS	4,926	4,828
CURRENT LIABILITIES
Accounts payable and accrued liabilities	207	194
Accounts payable due to associated companies	64	75
Capital lease obligations due within one year	8	8
Taxes accrued	64	62
Interest accrued	17	18
Other	106	119
Total Current Liabilities	466	476
DEFERRED CREDITS
Regulatory liabilities	161	147
Deferred income taxes, net	1,006	958
Investment tax credits	6	7
Other postretirement benefit obligations	68	67
Income taxes payable		3
Liabilities and accrued interest related to uncertain tax positions	54	52
Other	65	64
Total Deferred Credits	1,360	1,298
LONG-TERM LIABILITIES
Long-term debt	1,540	1,540
Capital lease obligations	82	86
Total Long-Term Liabilities	1,622	1,626
COMMITMENTS AND CONTINGENCIES
EQUITY
Premium on stock and other capital contributions	705	705
Retained earnings	773	723
Total Equity	1,478	1,428
TOTAL LIABILITIES AND EQUITY	4,926	4,828
Delmarva Power & Light Co/De [Member]
CURRENT ASSETS
Cash and cash equivalents	50	69
Accounts receivable, less allowance for uncollectible accounts	184	212
Inventories	39	41
Prepayments of income taxes	34	62
Prepaid expenses and other	24	22
Total Current Assets	331	406
INVESTMENTS AND OTHER ASSETS
Goodwill	8	8
Regulatory assets	217	242
Prepaid pension expense	171	139
Other	22	21
Total Investments and Other Assets	418	410
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,079	3,000
Accumulated depreciation	(915)	(901)
Net Property, Plant and Equipment	2,164	2,099
TOTAL ASSETS	2,913	2,915
CURRENT LIABILITIES
Short-term debt	105	105
Current portion of long-term debt and project funding	66	35
Accounts payable and accrued liabilities	90	98
Accounts payable due to associated companies	16	34
Taxes accrued	12	6
Interest accrued	6	7
Derivative liabilities	12	15
Other	61	73
Total Current Liabilities	368	373
DEFERRED CREDITS
Regulatory liabilities	304	310
Deferred income taxes, net	562	561
Investment tax credits	6	7
Other postretirement benefit obligations	26	22
Liabilities and accrued interest related to uncertain tax positions	22	24
Derivative liabilities	5	8
Other	35	39
Total Deferred Credits	960	971
LONG-TERM LIABILITIES
Long-term debt	699	730
COMMITMENTS AND CONTINGENCIES
EQUITY
Premium on stock and other capital contributions	347	347
Retained earnings	539	494
Total Equity	886	841
TOTAL LIABILITIES AND EQUITY	2,913	2,915
Atlantic City Electric Co [Member]
CURRENT ASSETS
Cash and cash equivalents	4	4
Restricted cash equivalents	11	11
Accounts receivable, less allowance for uncollectible accounts	211	212
Inventories	18	17
Prepayments of income taxes	51	55
Income taxes receivable	11	25
Prepaid expenses and other	65	9
Total Current Assets	371	333
INVESTMENTS AND OTHER ASSETS
Regulatory assets	654	667
Prepaid pension expense	76	51
Income taxes receivable	64	59
Restricted cash equivalents	9	5
Assets and accrued interest related to uncertain tax positions	39	38
Other	12	11
Total Investments and Other Assets	854	831
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	2,486	2,443
Accumulated depreciation	(747)	(729)
Net Property, Plant and Equipment	1,739	1,714
TOTAL ASSETS	2,964	2,878
CURRENT LIABILITIES
Short-term debt	48	181
Current portion of long-term debt and project funding	36	35
Accounts payable and accrued liabilities	132	120
Accounts payable due to associated companies	11	29
Taxes accrued	12	7
Interest accrued	15	13
Other	42	41
Total Current Liabilities	296	426
DEFERRED CREDITS
Regulatory liabilities	60	71
Deferred income taxes, net	681	659
Investment tax credits	8	8
Other postretirement benefit obligations	29	27
Other	16	13
Total Deferred Credits	794	778
LONG-TERM LIABILITIES
Long-term debt	833	633
Transition bonds issued by ACE Funding	314	332
Total Long-Term Liabilities	1,147	965
COMMITMENTS AND CONTINGENCIES
REDEEMABLE SERIAL PREFERRED STOCK		6
EQUITY
Common stock	26	26
Premium on stock and other capital contributions	516	516
Retained earnings	185	161
Total Equity	727	703
TOTAL LIABILITIES AND EQUITY	$ 2,964	$ 2,878