Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 39	$ 109
Restricted cash equivalents	9	11
Accounts receivable, less allowance for uncollectible accounts	840	929
Inventories	149	132
Derivative assets	9	5
Prepayments of income taxes	44	74
Deferred income tax assets, net	42	59
Prepaid expenses and other	157	120
Total Current Assets	1,289	1,439
INVESTMENTS AND OTHER ASSETS
Goodwill	1,407	1,407
Regulatory assets	2,288	2,196
Investment in finance leases held in trust	1,375	1,349
Income taxes receivable	218	84
Restricted cash equivalents	15	15
Assets and accrued interest related to uncertain tax positions	65	37
Derivative assets	8
Other	166	163
Total Investments and Other Assets	5,542	5,251
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	13,303	12,855
Accumulated depreciation	(4,713)	(4,635)
Net Property, Plant and Equipment	8,590	8,220
TOTAL ASSETS	15,421	14,910
CURRENT LIABILITIES
Short-term debt	875	732
Current portion of long-term debt and project funding	49	112
Accounts payable and accrued liabilities	526	549
Capital lease obligations due within one year	12	8
Taxes accrued	79	110
Interest accrued	50	47
Liabilities and accrued interest related to uncertain tax positions	9	3
Derivative liabilities	18	26
Other	258	274
Total Current Liabilities	1,876	1,861
DEFERRED CREDITS
Regulatory liabilities	525	526
Deferred income taxes, net	3,104	2,863
Investment tax credits	21	22
Pension benefit obligation	305	424
Other postretirement benefit obligations	446	469
Liabilities and accrued interest related to uncertain tax positions	6	32
Derivative liabilities	10	6
Other	182	191
Total Deferred Credits	4,599	4,533
LONG-TERM LIABILITIES
Long-term debt	4,203	3,794
Transition bonds issued by ACE Funding	276	295
Long-term project funding	13	13
Capital lease obligations	70	78
Total Long-Term Liabilities	4,562	4,180
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	2	2
Premium on stock and other capital contributions	3,354	3,325
Accumulated other comprehensive loss	(51)	(63)
Retained earnings	1,079	1,072
Total Equity	4,384	4,336
TOTAL LIABILITIES AND EQUITY	15,421	14,910
Potomac Electric Power Co [Member]
CURRENT ASSETS
Cash and cash equivalents	7	12
Accounts receivable, less allowance for uncollectible accounts	331	339
Inventories	61	50
Prepayments of income taxes	6	7
Income taxes receivable	31	31
Prepaid expenses and other	19	32
Total Current Assets	455	471
INVESTMENTS AND OTHER ASSETS
Regulatory assets	355	299
Prepaid pension expense	364	289
Investment in trust	30	31
Income taxes receivable	103	24
Assets and accrued interest related to uncertain tax positions	6
Other	60	55
Total Investments and Other Assets	918	698
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	6,790	6,578
Accumulated depreciation	(2,726)	(2,704)
Net Property, Plant and Equipment	4,064	3,874
TOTAL ASSETS	5,437	5,043
CURRENT LIABILITIES
Short-term debt	108	74
Accounts payable and accrued liabilities	217	209
Accounts payable due to associated companies	59	57
Capital lease obligations due within one year	12	8
Taxes accrued	54	63
Interest accrued	17	17
Other	108	110
Total Current Liabilities	575	538
DEFERRED CREDITS
Regulatory liabilities	169	169
Deferred income taxes, net	1,180	1,039
Investment tax credits	4	5
Other postretirement benefit obligations	67	66
Liabilities and accrued interest related to uncertain tax positions	3	38
Other	65	68
Total Deferred Credits	1,488	1,385
LONG-TERM LIABILITIES
Long-term debt	1,701	1,540
Capital lease obligations	70	78
Total Long-Term Liabilities	1,771	1,618
COMMITMENTS AND CONTINGENCIES
EQUITY
Premium on stock and other capital contributions	755	705
Retained earnings	848	797
Total Equity	1,603	1,502
TOTAL LIABILITIES AND EQUITY	5,437	5,043
Delmarva Power & Light Co/De [Member]
CURRENT ASSETS
Cash and cash equivalents	25	5
Accounts receivable, less allowance for uncollectible accounts	160	186
Inventories	50	44
Prepayments of income taxes	10	14
Income taxes receivable	10	11
Prepaid expenses and other	12	17
Total Current Assets	267	277
INVESTMENTS AND OTHER ASSETS
Goodwill	8	8
Regulatory assets	232	227
Prepaid pension expense	239	162
Assets and accrued interest related to uncertain tax positions	20
Other	13	23
Total Investments and Other Assets	512	420
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,314	3,188
Accumulated depreciation	(946)	(926)
Net Property, Plant and Equipment	2,368	2,262
TOTAL ASSETS	3,147	2,959
CURRENT LIABILITIES
Short-term debt	105	152
Current portion of long-term debt and project funding		66
Accounts payable and accrued liabilities	93	92
Accounts payable due to associated companies	21	21
Taxes accrued	5	11
Interest accrued	9	6
Derivative liabilities	10	12
Other	61	59
Total Current Liabilities	304	419
DEFERRED CREDITS
Regulatory liabilities	292	297
Deferred income taxes, net	647	615
Investment tax credits	6	6
Other postretirement benefit obligations	23	22
Liabilities and accrued interest related to uncertain tax positions		9
Derivative liabilities		3
Other	41	37
Total Deferred Credits	1,009	989
LONG-TERM LIABILITIES
Total Long-Term Liabilities	948	699
COMMITMENTS AND CONTINGENCIES
EQUITY
Premium on stock and other capital contributions	347	347
Retained earnings	539	505
Total Equity	886	852
TOTAL LIABILITIES AND EQUITY	3,147	2,959
Atlantic City Electric Co [Member]
CURRENT ASSETS
Cash and cash equivalents	3	91
Restricted cash equivalents	9	11
Accounts receivable, less allowance for uncollectible accounts	188	185
Inventories	29	25
Prepayments of income taxes	27	26
Income taxes receivable	5	5
Prepaid expenses and other	57	16
Total Current Assets	318	359
INVESTMENTS AND OTHER ASSETS
Regulatory assets	685	662
Prepaid pension expense	94	71
Income taxes receivable	133	61
Restricted cash equivalents	15	15
Assets and accrued interest related to uncertain tax positions	22	42
Derivative assets	8
Other	13	14
Total Investments and Other Assets	970	865
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	2,639	2,548
Accumulated depreciation	(777)	(766)
Net Property, Plant and Equipment	1,862	1,782
TOTAL ASSETS	3,150	3,006
CURRENT LIABILITIES
Short-term debt	97	23
Current portion of long-term debt and project funding	38	37
Accounts payable and accrued liabilities	129	117
Accounts payable due to associated companies	13	14
Taxes accrued	16	10
Interest accrued	15	15
Other	41	45
Total Current Liabilities	349	261
DEFERRED CREDITS
Regulatory liabilities	64	60
Deferred income taxes, net	760	698
Investment tax credits	7	7
Other postretirement benefit obligations	33	31
Derivative liabilities	9
Other	17	20
Total Deferred Credits	890	816
LONG-TERM LIABILITIES
Long-term debt	832	832
Transition bonds issued by ACE Funding	276	295
Total Long-Term Liabilities	1,108	1,127
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	26	26
Premium on stock and other capital contributions	576	576
Retained earnings	201	200
Total Equity	803	802
TOTAL LIABILITIES AND EQUITY	$ 3,150	$ 3,006