Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 25		$ 109
Restricted cash equivalents	10		11
Accounts receivable, less allowance for uncollectible accounts	837		929
Inventories	156		132
Derivative assets	1		5
Prepayments of income taxes	59		74
Deferred income tax assets, net	28		59
Prepaid expenses and other	133		120
Total Current Assets	1,249		1,439
Investments and Other Assets
Goodwill	1,407		1,407
Regulatory assets	2,614		2,196
Investment in finance leases held in trust	1,237	[1]	1,349	[1]
Income taxes receivable	217		84
Restricted cash equivalents	17		15
Assets and accrued interest related to uncertain tax positions	18		37
Derivative assets	8
Other	163		163
Total Investments and Other Assets	5,681		5,251
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	13,625		12,855
Accumulated depreciation	(4,779)		(4,635)
Net Property, Plant and Equipment	8,846		8,220
Total Assets	15,776		14,910
CURRENT LIABILITIES
Short-term debt	965		732
Current portion of long-term debt	569		112
Accounts payable and accrued liabilities	574		549
Capital lease obligations due within one year	8		8
Taxes accrued	75		110
Interest accrued	47		47
Liabilities and accrued interest related to uncertain tax positions	9		3
Derivative liabilities	7		26
Other	273		274
Total Current Liabilities	2,527		1,861
Deferred Credits
Regulatory liabilities	501		526
Deferred income taxes, net	3,176		2,863
Investment tax credits	20		22
Pension benefit obligation	449		424
Other postretirement benefit obligations	454		469
Liabilities and accrued interest related to uncertain tax positions	15		32
Derivative liabilities	11		6
Other	191		191
Total Deferred Credits	4,817		4,533
LONG-TERM LIABILITIES
Long-Term Debt	3,648		3,794
Transition bonds issued by ACE Funding	256		295
Long-term project funding	12		13
Capital lease obligations	70		78
Total Long-Term Liabilities	3,986		4,180
COMMITMENTS AND CONTINGENCIES
Equity
Common stock	2		2
Premium on stock and other capital contributions	3,383		3,325
Accumulated other comprehensive loss	(48)		(63)
Retained earnings	1,109		1,072
Total Equity	4,446		4,336
Total Liabilities and Equity	15,776		14,910
Potomac Electric Power Co [Member]
CURRENT ASSETS
Cash and cash equivalents	9		12
Accounts receivable, less allowance for uncollectible accounts	318		339
Inventories	69		50
Prepayments of income taxes	9		7
Deferred income tax assets, net	9		11
Income taxes receivable	31		31
Prepaid expenses and other	25		32
Total Current Assets	461		471
Investments and Other Assets
Regulatory assets	487		299
Prepaid pension expense	353		289
Investment in trust	31		31
Income taxes receivable	102		24
Other	59		55
Total Investments and Other Assets	1,032		698
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	6,850		6,578
Accumulated depreciation	(2,705)		(2,704)
Net Property, Plant and Equipment	4,145		3,874
Total Assets	5,638		5,043
CURRENT LIABILITIES
Short-term debt	231		74
Current portion of long-term debt	200
Accounts payable and accrued liabilities	214		209
Accounts payable due to associated companies	41		57
Capital lease obligations due within one year	8		8
Taxes accrued	58		63
Interest accrued	17		17
Other	106		110
Total Current Liabilities	875		538
Deferred Credits
Regulatory liabilities	141		169
Deferred income taxes, net	1,219		1,039
Investment tax credits	4		5
Other postretirement benefit obligations	66		66
Liabilities and accrued interest related to uncertain tax positions	53		38
Other	66		68
Total Deferred Credits	1,549		1,385
LONG-TERM LIABILITIES
Long-Term Debt	1,501		1,540
Capital lease obligations	70		78
Total Long-Term Liabilities	1,571		1,618
COMMITMENTS AND CONTINGENCIES
Equity
Premium on stock and other capital contributions	755		705
Retained earnings	888		797
Total Equity	1,643		1,502
Total Liabilities and Equity	5,638		5,043
Delmarva Power & Light Co/De [Member]
CURRENT ASSETS
Cash and cash equivalents	6		5
Accounts receivable, less allowance for uncollectible accounts	201		186
Inventories	53		44
Prepayments of income taxes	10		14
Deferred income tax assets, net	11		11
Income taxes receivable	10		11
Prepaid expenses and other	20		17
Total Current Assets	300		277
Investments and Other Assets
Goodwill	8		8
Regulatory assets	288		227
Prepaid pension expense	232		162
Assets and accrued interest related to uncertain tax positions	20
Other	12		23
Total Investments and Other Assets	560		420
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,422		3,188
Accumulated depreciation	(1,000)		(926)
Net Property, Plant and Equipment	2,422		2,262
Total Assets	3,282		2,959
CURRENT LIABILITIES
Short-term debt	137		152
Current portion of long-term debt	250		66
Accounts payable and accrued liabilities	125		92
Accounts payable due to associated companies	20		21
Taxes accrued	4		11
Interest accrued	6		6
Derivative liabilities	4		12
Other	61		59
Total Current Liabilities	607		419
Deferred Credits
Regulatory liabilities	258		297
Deferred income taxes, net	697		615
Investment tax credits	5		6
Other postretirement benefit obligations	22		22
Liabilities and accrued interest related to uncertain tax positions			9
Derivative liabilities			3
Other	41		37
Total Deferred Credits	1,023		989
LONG-TERM LIABILITIES
Long-Term Debt	667		699
COMMITMENTS AND CONTINGENCIES
Equity
Premium on stock and other capital contributions	407		347
Retained earnings	578		505
Total Equity	985		852
Total Liabilities and Equity	3,282		2,959
Atlantic City Electric Co [Member]
CURRENT ASSETS
Cash and cash equivalents	6		91
Restricted cash equivalents	10		11
Accounts receivable, less allowance for uncollectible accounts	192		185
Inventories	30		25
Prepayments of income taxes	27		26
Deferred income tax assets, net	10		9
Income taxes receivable	5		5
Prepaid expenses and other	11		16
Total Current Assets	281		359
Investments and Other Assets
Regulatory assets	694		662
Prepaid pension expense	88		71
Income taxes receivable	133		61
Restricted cash equivalents	17		15
Assets and accrued interest related to uncertain tax positions	12		42
Derivative assets	8
Other	12		14
Total Investments and Other Assets	964		865
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	2,771		2,548
Accumulated depreciation	(787)		(766)
Net Property, Plant and Equipment	1,984		1,782
Total Assets	3,229		3,006
CURRENT LIABILITIES
Short-term debt	133		23
Current portion of long-term debt	108		37
Accounts payable and accrued liabilities	147		117
Accounts payable due to associated companies	14		14
Taxes accrued	10		10
Interest accrued	15		15
Other	47		45
Total Current Liabilities	474		261
Deferred Credits
Regulatory liabilities	102		60
Deferred income taxes, net	766		698
Investment tax credits	6		7
Other postretirement benefit obligations	34		31
Derivative liabilities	11
Other	18		20
Total Deferred Credits	937		816
LONG-TERM LIABILITIES
Long-Term Debt	760		832
Transition bonds issued by ACE Funding	256		295
Total Long-Term Liabilities	1,016		1,127
COMMITMENTS AND CONTINGENCIES
Equity
Common stock	26		26
Premium on stock and other capital contributions	576		576
Retained earnings	200		200
Total Equity	802		802
Total Liabilities and Equity	$ 3,229		$ 3,006

[1] Excludes the credit ratings of collateral posted by the lessees in these transactions.