Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Cash and cash equivalents	$ 141	$ 14
Restricted cash equivalents	17	25
Accounts receivable, less allowance for uncollectible accounts	978	782
Inventories	148	141
Deferred income tax assets, net	47	50
Income taxes and related accrued interest receivable	13	9
Prepaid expenses and other	67	63
Total Current Assets	1,411	1,084
OTHER ASSETS
Goodwill	1,406	1,407
Regulatory assets	2,291	2,409
Income taxes and related accrued interest receivable	81	81
Restricted cash equivalents	13	14
Other	168	166
Total Other Assets	3,959	4,077
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	15,546	15,465
Accumulated depreciation	(4,889)	(4,959)
Net Property, Plant and Equipment	10,657	10,506
TOTAL ASSETS	16,027	15,667
CURRENT LIABILITIES
Short-term debt	803	729
Current portion of long-term debt and project funding	412	431
Accounts payable	206	174
Accrued liabilities	302	313
Capital lease obligations due within one year	10	10
Taxes accrued	43	41
Interest accrued	75	47
Liabilities and accrued interest related to uncertain tax positions	6	6
Other	300	314
Total Current Liabilities	2,157	2,065
DEFERRED CREDITS
Regulatory liabilities	370	343
Deferred income tax liabilities, net	3,294	3,266
Investment tax credits	15	16
Pension benefit obligation	401	396
Other postretirement benefit obligations	264	265
Liabilities and accrued interest related to uncertain tax positions	2	2
Other	194	193
Total Deferred Credits	4,540	4,481
OTHER LONG-TERM LIABILITIES
Long-term debt	4,649	4,441
Transition bonds issued by ACE Funding	159	171
Long-term project funding	8	8
Capital lease obligations	50	50
Total Other Long-Term Liabilities	4,866	4,670
COMMITMENTS AND CONTINGENCIES
PREFERRED STOCK
Series A preferred stock, $.01 par value, 18,000 shares authorized, 14,400 and 12,600 shares outstanding, respectively	147	129
EQUITY
Common stock	3	3
Premium on stock and other capital contributions	3,809	3,800
Accumulated other comprehensive loss	(45)	(46)
Retained earnings	550	565
Total Equity	4,317	4,322
TOTAL LIABILITIES AND EQUITY	16,027	15,667
Potomac Electric Power Co [Member]
CURRENT ASSETS
Cash and cash equivalents	126	6
Restricted cash equivalents	2	5
Accounts receivable, less allowance for uncollectible accounts	406	315
Inventories	69	62
Deferred income tax assets, net	6	14
Income taxes and related accrued interest receivable	94	94
Prepaid expenses and other	21	21
Total Current Assets	724	517
OTHER ASSETS
Regulatory assets	655	697
Prepaid pension expense	309	316
Investment in trust	34	34
Income taxes and related accrued interest receivable	30	30
Other	75	71
Total Other Assets	1,103	1,148
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	7,753	7,764
Accumulated depreciation	(2,734)	(2,816)
Net Property, Plant and Equipment	5,019	4,948
TOTAL ASSETS	6,846	6,613
CURRENT LIABILITIES
Short-term debt		104
Current portion of long-term debt and project funding		12
Accounts payable	101	94
Accrued liabilities	80	91
Accounts payable due to associated companies	51	30
Capital lease obligations due within one year	10	10
Taxes accrued	25	32
Interest accrued	32	19
Customer deposits	43	44
Other	91	102
Total Current Liabilities	433	538
DEFERRED CREDITS
Regulatory liabilities	114	104
Deferred income tax liabilities, net	1,564	1,584
Investment tax credits	2	2
Other postretirement benefit obligations	55	57
Other	71	67
Total Deferred Credits	1,806	1,814
OTHER LONG-TERM LIABILITIES
Long-term debt	2,332	2,124
Capital lease obligations	50	50
Total Other Long-Term Liabilities	2,382	2,174
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock
Premium on stock and other capital contributions	1,122	1,010
Retained earnings	1,103	1,077
Total Equity	2,225	2,087
TOTAL LIABILITIES AND EQUITY	6,846	6,613
Delmarva Power & Light Co/De [Member]
CURRENT ASSETS
Cash and cash equivalents	7	4
Restricted cash equivalents		5
Accounts receivable, less allowance for uncollectible accounts	266	193
Inventories	54	55
Deferred income tax assets, net	20	16
Income taxes and related accrued interest receivable	34	34
Prepaid expenses and other	9	12
Total Current Assets	390	319
OTHER ASSETS
Goodwill	8	8
Regulatory assets	344	356
Prepaid pension expense	217	220
Income taxes and related accrued interest receivable	4	4
Other	12	12
Total Other Assets	585	600
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,996	3,946
Accumulated depreciation	(1,027)	(1,021)
Net Property, Plant and Equipment	2,969	2,925
TOTAL ASSETS	3,944	3,844
CURRENT LIABILITIES
Short-term debt	280	211
Current portion of long-term debt and project funding	100	100
Accounts payable	51	39
Accrued liabilities	70	74
Accounts payable due to associated companies	21	17
Taxes accrued	4	3
Interest accrued	14	7
Customer deposits	25	24
Other	42	42
Total Current Liabilities	607	517
DEFERRED CREDITS
Regulatory liabilities	241	225
Deferred income tax liabilities, net	920	893
Investment tax credits	4	4
Other postretirement benefit obligations	20	21
Other	33	35
Total Deferred Credits	1,218	1,178
OTHER LONG-TERM LIABILITIES
Long-term debt	971	971
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock
Premium on stock and other capital contributions	537	537
Retained earnings	611	641
Total Equity	1,148	1,178
TOTAL LIABILITIES AND EQUITY	3,944	3,844
Atlantic City Electric Co [Member]
CURRENT ASSETS
Cash and cash equivalents	6	2
Restricted cash equivalents	11	10
Accounts receivable, less allowance for uncollectible accounts	204	167
Inventories	25	23
Income taxes and related accrued interest receivable	151	151
Prepaid expenses and other	12	13
Total Current Assets	409	366
OTHER ASSETS
Regulatory assets	377	427
Prepaid pension expense	93	96
Income taxes and related accrued interest receivable	34	34
Restricted cash equivalents	13	14
Other	12	12
Total Other Assets	529	583
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,126	3,073
Accumulated depreciation	(772)	(760)
Net Property, Plant and Equipment	2,354	2,313
TOTAL ASSETS	3,292	3,262
CURRENT LIABILITIES
Short-term debt	143	127
Current portion of long-term debt and project funding	59	59
Accounts payable	28	20
Accrued liabilities	109	103
Accounts payable due to associated companies	17	15
Taxes accrued	8	1
Interest accrued	19	13
Customer deposits	22	21
Other	22	22
Total Current Liabilities	427	381
DEFERRED CREDITS
Regulatory liabilities	14	14
Deferred income tax liabilities, net	868	865
Investment tax credits	5	5
Other postretirement benefit obligations	36	36
Other	17	16
Total Deferred Credits	940	936
OTHER LONG-TERM LIABILITIES
Long-term debt	888	888
Transition bonds issued by ACE Funding	159	171
Total Other Long-Term Liabilities	1,047	1,059
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	26	26
Premium on stock and other capital contributions	651	651
Retained earnings	201	209
Total Equity	878	886
TOTAL LIABILITIES AND EQUITY	$ 3,292	$ 3,262