Consolidated Statements Of Income (Loss) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating Revenue
Power Delivery	$ 1,329	$ 1,600	$ 3,671	$ 4,011
Pepco Energy Services	312	457	993	1,480
Other	2	10	22	31
Total Operating Revenue	1,643	2,067	4,686	5,522
Operating Expenses
Fuel and purchased energy	943	1,319	2,747	3,683
Other services cost of sales	42	38	128	98
Other operation and maintenance	239	228	682	636
Restructuring charge		14		14
Depreciation and amortization	115	104	325	286
Other taxes	126	130	346	327
Gain on early termination of finance leases held in trust			(39)
Deferred electric service costs	(17)	13	(49)	(69)
Effects of divestiture-related claims		9		11
Total Operating Expenses	1,448	1,855	4,140	4,986
Operating Income	195	212	546	536
Other Income (Expenses)
Interest expense	(64)	(68)	(189)	(240)
Loss from equity investments	(3)		(4)	(1)
Loss on extinguishment of debt		(135)		(135)
Other income	7	6	27	17
Total Other Expenses	(60)	(197)	(166)	(359)
Income from Continuing Operations Before Income Tax Expense	135	15	380	177
Income Tax Expense (Benefit) Related to Continuing Operations	55	(6)	143	52
Net Income from Continuing Operations	80	21	237	125
(Loss) Income from Discontinued Operations, Net of Income Taxes		(4)	1	(126)
Net Income (Loss)	80	17	238	(1)
Retained Earnings at Beginning of Period	1,095	1,130	1,059	1,268
Dividends paid on common stock (Note 15)	(61)	(61)	(183)	(181)
Retained Earnings at End of Period	1,114	1,086	1,114	1,086
Basic and Diluted Share Information
Weighted average shares outstanding	226	224	226	223
Earnings per share of common stock from Continuing Operations	$ 0.35	$ 0.09	$ 1.05	$ 0.56
Loss per share of common stock from Discontinued Operations		$ (0.01)		$ (0.56)
Basic and diluted earnings per share	$ 0.35	$ 0.08	$ 1.05
Potomac Electric Power Co [Member]
Operating Revenue
Total Operating Revenue	603	706	1,643	1,797
Operating Expenses
Purchased energy	258	356	731	932
Other operation and maintenance	111	93	313	252
Restructuring charge		6		6
Depreciation and amortization	44	43	128	121
Other taxes	108	110	294	273
Effects of divestiture-related claims		9		11
Total Operating Expenses	521	617	1,466	1,595
Operating Income	82	89	177	202
Other Income (Expenses)
Interest and dividend income				1
Interest expense	(24)	(24)	(70)	(74)
Other income	3	5	13	10
Total Other Expenses	(21)	(19)	(57)	(63)
Income Before Income Tax Expense	61	70	120	139
Income Tax Expense (Benefit) Related to Continuing Operations	23	33	32	62
Net Income (Loss)	38	37	88	77
Retained Earnings at Beginning of Period	773	720	723	730
Dividends paid to Parent		(45)		(95)
Retained Earnings at End of Period	811	712	811	712
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	298	342	841	901
Natural Gas	28	35	169	166
Total Operating Revenue	326	377	1,010	1,067
Operating Expenses
Purchased energy	180	225	507	585
Gas purchased	18	26	114	117
Other operation and maintenance	69	65	181	191
Restructuring charge		4		4
Depreciation and amortization	22	22	66	62
Other taxes	8	10	28	28
Total Operating Expenses	297	352	896	987
Operating Income	29	25	114	80
Other Income (Expenses)
Interest expense	(11)	(10)	(33)	(32)
Other income	3	1	7	4
Total Other Expenses	(8)	(9)	(26)	(28)
Income Before Income Tax Expense	21	16	88	52
Income Tax Expense (Benefit) Related to Continuing Operations	10	7	32	23
Net Income (Loss)	11	9	56	29
Retained Earnings at Beginning of Period	539	469	494	472
Dividends paid to Parent	(50)		(50)	(23)
Retained Earnings at End of Period	500	478	500	478
Atlantic City Electric Co [Member]
Operating Revenue
Total Operating Revenue	399	518	1,018	1,150
Operating Expenses
Purchased energy	254	341	648	819
Other operation and maintenance	61	54	167	151
Restructuring charge		3		3
Depreciation and amortization	41	32	107	81
Other taxes	8	8	19	20
Deferred electric service costs	(17)	13	(49)	(69)
Total Operating Expenses	347	451	892	1,005
Operating Income	52	67	126	145
Other Income (Expenses)
Interest expense	(18)	(17)	(51)	(49)
Other income			2	1
Total Other Expenses	(18)	(17)	(49)	(48)
Income Before Income Tax Expense	34	50	77	97
Income Tax Expense (Benefit) Related to Continuing Operations	17	20	36	43
Net Income (Loss)	17	30	41	54
Retained Earnings at Beginning of Period	185	167	161	143
Retained Earnings at End of Period	$ 202	$ 197	$ 202	$ 197