CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 15	$ 25
Restricted cash equivalents	20	10
Accounts receivable, less allowance for uncollectible accounts	803	804
Inventories	161	153
Prepayments of income taxes	41	59
Deferred income tax assets, net	36	28
Income taxes receivable	225	69
Prepaid expenses and other	81	81
Assets held for disposition	14	38
Total Current Assets	1,396	1,267
INVESTMENTS AND OTHER ASSETS
Goodwill	1,407	1,407
Regulatory assets	2,510	2,614
Investment in finance leases held in trust	167	1,237
Income taxes receivable	64	217
Restricted cash equivalents	15	17
Assets and accrued interest related to uncertain tax positions	9	18
Derivative assets	4	8
Other	164	163
Total Investments and Other Assets	4,340	5,681
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	14,083	13,625
Accumulated depreciation	(4,830)	(4,779)
Net Property, Plant and Equipment	9,253	8,846
TOTAL ASSETS	14,989	15,794
CURRENT LIABILITIES
Short-term debt	392	965
Current portion of long-term debt and project funding	756	569
Accounts payable and accrued liabilities	523	554
Capital lease obligations due within one year	9	8
Taxes accrued	50	75
Interest accrued	52	47
Liabilities and accrued interest related to uncertain tax positions	377	9
Derivative liabilities		4
Other	253	272
Liabilities associated with assets held for disposition	12	40
Total Current Liabilities	2,424	2,543
DEFERRED CREDITS
Regulatory liabilities	439	501
Deferred income tax liabilities, net	2,770	3,208
Investment tax credits	19	20
Pension benefit obligation	310	449
Other postretirement benefit obligations	434	454
Liabilities and accrued interest related to uncertain tax positions	28	15
Derivative liabilities	14	11
Other	192	191
Liabilities associated with assets held for disposition		2
Total Deferred Credits	4,206	4,851
LONG-TERM LIABILITIES
Long-term debt	3,811	3,648
Transition bonds issued by ACE Funding	236	256
Long-term project funding	11	12
Capital lease obligations	65	70
Total Long-Term Liabilities	4,123	3,986
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	2	2
Premium on stock and other capital contributions	3,720	3,383
Accumulated other comprehensive loss	(41)	(48)
Retained earnings	555	1,077
Total Equity	4,236	4,414
TOTAL LIABILITIES AND EQUITY	14,989	15,794
Potomac Electric Power Co [Member]
CURRENT ASSETS
Cash and cash equivalents	6	9
Restricted cash equivalents	3
Accounts receivable, less allowance for uncollectible accounts	331	318
Inventories	72	69
Prepayments of income taxes	9	9
Income taxes receivable	101	31
Prepaid expenses and other	13	25
Total Current Assets	535	461
INVESTMENTS AND OTHER ASSETS
Regulatory assets	512	487
Prepaid pension expense	343	353
Investment in trust	31	31
Income taxes receivable	35	102
Other	64	59
Total Investments and Other Assets	985	1,032
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	7,054	6,850
Accumulated depreciation	(2,722)	(2,705)
Net Property, Plant and Equipment	4,332	4,145
TOTAL ASSETS	5,852	5,638
CURRENT LIABILITIES
Short-term debt		231
Current portion of long-term debt and project funding	375	200
Accounts payable and accrued liabilities	202	214
Accounts payable due to associated companies	35	41
Capital lease obligations due within one year	9	8
Taxes accrued	26	58
Interest accrued	20	17
Liabilities and accrued interest related to uncertain tax positions	24
Customer deposits	48	48
Other	60	58
Total Current Liabilities	799	875
DEFERRED CREDITS
Regulatory liabilities	130	141
Deferred income tax liabilities, net	1,274	1,219
Investment tax credits	3	4
Other postretirement benefit obligations	68	66
Liabilities and accrued interest related to uncertain tax positions	9	53
Other	66	66
Total Deferred Credits	1,550	1,549
LONG-TERM LIABILITIES
Long-term debt	1,575	1,501
Capital lease obligations	65	70
Total Long-Term Liabilities	1,640	1,571
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock
Premium on stock and other capital contributions	930	755
Retained earnings	933	888
Total Equity	1,863	1,643
TOTAL LIABILITIES AND EQUITY	5,852	5,638
Delmarva Power & Light Co/De [Member]
CURRENT ASSETS
Cash and cash equivalents	3	6
Accounts receivable, less allowance for uncollectible accounts	182	201
Inventories	56	53
Prepayments of income taxes	10	10
Income taxes receivable	5	10
Assets and accrued interest related to uncertain tax positions	18
Prepaid expenses and other	14	20
Total Current Assets	288	300
INVESTMENTS AND OTHER ASSETS
Goodwill	8	8
Regulatory assets	284	288
Prepaid pension expense	235	232
Assets and accrued interest related to uncertain tax positions	3	20
Other	12	12
Total Investments and Other Assets	542	560
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,535	3,422
Accumulated depreciation	(1,011)	(1,000)
Net Property, Plant and Equipment	2,524	2,422
TOTAL ASSETS	3,354	3,282
CURRENT LIABILITIES
Short-term debt	214	137
Current portion of long-term debt and project funding	250	250
Accounts payable and accrued liabilities	95	125
Accounts payable due to associated companies	18	20
Taxes accrued	3	4
Interest accrued	9	6
Derivative liabilities		4
Other	63	61
Total Current Liabilities	652	607
DEFERRED CREDITS
Regulatory liabilities	240	258
Deferred income tax liabilities, net	726	697
Investment tax credits	5	5
Other postretirement benefit obligations	25	22
Other	36	41
Total Deferred Credits	1,032	1,023
LONG-TERM LIABILITIES
Long-term debt	667	667
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock
Premium on stock and other capital contributions	407	407
Retained earnings	596	578
Total Equity	1,003	985
TOTAL LIABILITIES AND EQUITY	3,354	3,282
Atlantic City Electric Co [Member]
CURRENT ASSETS
Cash and cash equivalents	4	6
Restricted cash equivalents	9	10
Accounts receivable, less allowance for uncollectible accounts	193	192
Inventories	32	30
Prepayments of income taxes	17	27
Income taxes receivable	111	5
Assets and accrued interest related to uncertain tax positions	14
Prepaid expenses and other	53	11
Total Current Assets	433	281
INVESTMENTS AND OTHER ASSETS
Regulatory assets	648	694
Prepaid pension expense	112	88
Income taxes receivable	27	133
Restricted cash equivalents	15	17
Assets and accrued interest related to uncertain tax positions	6	12
Derivative assets	4	8
Other	12	12
Total Investments and Other Assets	824	964
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	2,863	2,771
Accumulated depreciation	(791)	(787)
Net Property, Plant and Equipment	2,072	1,984
TOTAL ASSETS	3,329	3,229
CURRENT LIABILITIES
Short-term debt	64	133
Current portion of long-term debt and project funding	109	108
Accounts payable and accrued liabilities	152	147
Accounts payable due to associated companies	13	14
Taxes accrued	17	10
Interest accrued	14	15
Customer deposits	25	25
Other	17	22
Total Current Liabilities	411	474
DEFERRED CREDITS
Regulatory liabilities	68	102
Deferred income tax liabilities, net	789	766
Investment tax credits	6	6
Other postretirement benefit obligations	36	34
Derivative liabilities	14	11
Other	16	18
Total Deferred Credits	929	937
LONG-TERM LIABILITIES
Long-term debt	860	760
Transition bonds issued by ACE Funding	236	256
Total Long-Term Liabilities	1,096	1,016
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	26	26
Premium on stock and other capital contributions	651	576
Retained earnings	216	200
Total Equity	893	802
TOTAL LIABILITIES AND EQUITY	$ 3,329	$ 3,229