Consolidated Statements Of Income (Loss) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating Revenue
Power Delivery	$ 1,093	$ 1,149	$ 2,342	$ 2,411
Pepco Energy Services	308	476	681	1,023
Other	8	11	20	21
Total Operating Revenue	1,409	1,636	3,043	3,455
Operating Expenses
Fuel and purchased energy	809	1,077	1,804	2,364
Other services cost of sales	43	35	86	60
Other operation and maintenance	209	196	443	410
Depreciation and amortization	105	93	210	182
Other taxes	109	105	220	197
Gain on early termination of finance leases held in trust	(39)		(39)
Deferred electric service costs	(29)	(63)	(32)	(82)
Total Operating Expenses	1,207	1,443	2,692	3,131
Operating Income	202	193	351	324
Other Income (Expenses)
Interest expense	(63)	(89)	(125)	(172)
Loss from equity investments			(1)	(1)
Other income	10	5	20	11
Total Other Expenses	(53)	(84)	(106)	(162)
Income from Continuing Operations Before Income Tax Expense	149	109	245	162
Income Tax Expense Related to Continuing Operations	54	33	88	58
Net Income from Continuing Operations	95	76	157	104
(Loss) Income from Discontinued Operations, Net of Income Taxes	(1)	(130)	1	(122)
Net Income (Loss)	94	(54)	158	(18)
Retained Earnings at Beginning of Period	1,062	1,244	1,059	1,268
Dividends paid	(61)	(60)	(122)	(120)
Retained Earnings at End of Period	1,095	1,130	1,095	1,130
Basic and Diluted Share Information
Weighted average shares outstanding (millions)	226	223	226	223
Earnings per share of common stock from Continuing Operations	$ 0.42	$ 0.34	$ 0.69	$ 0.47
(Loss) earnings per share of common stock from Discontinued Operations		$ (0.58)	$ 0.01	$ (0.55)
Basic and diluted earnings (loss) per share	$ 0.42	$ (0.24)	$ 0.70	$ (0.08)
Potomac Electric Power Co [Member]
Operating Revenue
Total Operating Revenue	506	539	1,040	1,091
Operating Expenses
Purchased energy	218	261	473	576
Other operation and maintenance	100	73	202	161
Depreciation and amortization	42	40	84	78
Other taxes	94	88	186	163
Total Operating Expenses	454	462	945	978
Operating Income	52	77	95	113
Other Income (Expenses)
Interest and dividend income		1		1
Interest expense	(22)	(25)	(46)	(50)
Other income	4	2	10	5
Total Other Expenses	(18)	(22)	(36)	(44)
Income Before Income Tax Expense	34	55	59	69
Income Tax Expense Related to Continuing Operations	2	23	9	29
Net Income (Loss)	32	32	50	40
Retained Earnings at Beginning of Period	741	713	723	730
Dividends paid		(25)		(50)
Retained Earnings at End of Period	773	720	773	720
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	245	260	543	559
Natural Gas	39	36	141	131
Total Operating Revenue	284	296	684	690
Operating Expenses
Purchased energy	145	159	327	360
Gas purchased	25	25	96	91
Other operation and maintenance	47	65	112	126
Depreciation and amortization	22	20	44	40
Other taxes	9	8	20	18
Total Operating Expenses	248	277	599	635
Operating Income	36	19	85	55
Other Income (Expenses)
Interest expense	(11)	(12)	(22)	(22)
Other income	2	2	4	3
Total Other Expenses	(9)	(10)	(18)	(19)
Income Before Income Tax Expense	27	9	67	36
Income Tax Expense Related to Continuing Operations	5	3	22	16
Net Income (Loss)	22	6	45	20
Retained Earnings at Beginning of Period	517	486	494	472
Dividends paid		(23)		(23)
Retained Earnings at End of Period	539	469	539	469
Atlantic City Electric Co [Member]
Operating Revenue
Total Operating Revenue	304	315	619	632
Operating Expenses
Purchased energy	196	243	394	478
Other operation and maintenance	51	47	106	97
Depreciation and amortization	33	25	66	49
Other taxes	5	6	11	12
Deferred electric service costs	(29)	(63)	(32)	(82)
Total Operating Expenses	256	258	545	554
Operating Income	48	57	74	78
Other Income (Expenses)
Interest expense	(18)	(16)	(33)	(32)
Other income	2	1	2	1
Total Other Expenses	(16)	(15)	(31)	(31)
Income Before Income Tax Expense	32	42	43	47
Income Tax Expense Related to Continuing Operations	14	16	19	23
Net Income (Loss)	18	26	24	24
Retained Earnings at Beginning of Period	167	141	161	143
Retained Earnings at End of Period	$ 185	$ 167	$ 185	$ 167