CONSOLIDATED STATEMENTS OF INCOME (LOSS) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating Revenue
Power Delivery	$ 1,006	$ 984	$ 2,130	$ 2,039
Pepco Energy Services	49	76	106	148
Other	(2)	10	(371)	19
Total Operating Revenue	1,053	1,070	1,865	2,206
Operating Expenses
Fuel and purchased energy	446	465	1,008	1,010
Other services cost of sales	35	49	75	94
Other operation and maintenance	213	220	441	441
Depreciation and amortization	116	111	228	221
Other taxes	101	105	206	209
Loss on early termination of finance leases held in trust	14		14
Deferred electric service costs	(4)	(20)	(3)	(35)
Impairment losses		3		3
Total Operating Expenses	921	933	1,969	1,943
Operating Income	132	137	(104)	263
Other Income (Expenses)
Interest expense	(70)	(65)	(137)	(130)
Other income	8	10	16	18
Total Other Expenses	(62)	(55)	(121)	(112)
Income (Loss) from Continuing Operations Before Income Tax Expense	70	82	(225)	151
Income Tax Expense Related to Continuing Operations	32	29	167	38
Net Income (Loss) from Continuing Operations	38	53	(392)	113
Income from Discontinued Operations, Net of Income Taxes	4	9	4	17
Net (Loss) Income	42	62	(388)	130
Basic and Diluted Share Information
Weighted average shares outstanding - Basic	249	228	243	228
Weighted average shares outstanding - Diluted	249	229	243	229
Earnings (Loss) per share of common stock from Continuing Operations - Basic and Diluted	$ 0.16	$ 0.23	$ (1.61)	$ 0.50
Earnings per share of common stock from Discontinued Operations - Basic and Diluted	$ 0.01	$ 0.04	$ 0.01	$ 0.07
Basic and Diluted earnings (loss) per share	$ 0.17	$ 0.27	$ (1.60)	$ 0.57
Potomac Electric Power Co [Member]
Operating Revenue
Total Operating Revenue	469	456	946	921
Operating Revenue	469	456	946	921
Operating Expenses
Purchased energy	157	160	349	345
Other operation and maintenance	95	101	197	204
Depreciation and amortization	49	48	96	95
Other taxes	88	92	177	182
Total Operating Expenses	389	401	819	826
Operating Income	80	55	127	95
Other Income (Expenses)
Interest expense	(28)	(24)	(54)	(49)
Other income	5	4	9	8
Total Other Expenses	(23)	(20)	(45)	(41)
Income (Loss) from Continuing Operations Before Income Tax Expense	57	35	82	54
Income Tax Expense Related to Continuing Operations	20	8	22	3
Net (Loss) Income	37	27	60	51
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	237	235	522	494
Natural gas	29	24	114	98
Total Operating Revenue	266	259	636	592
Operating Revenue	266	259	636	592
Operating Expenses
Purchased energy	121	122	280	265
Gas purchased	15	13	69	62
Other operation and maintenance	63	62	132	127
Depreciation and amortization	27	25	52	49
Other taxes	9	7	19	16
Total Operating Expenses	235	229	552	519
Operating Income	31	30	84	73
Other Income (Expenses)
Interest expense	(12)	(11)	(25)	(22)
Other income	2	3	4	6
Total Other Expenses	(10)	(8)	(21)	(16)
Income (Loss) from Continuing Operations Before Income Tax Expense	21	22	63	57
Income Tax Expense Related to Continuing Operations	9	9	25	23
Net (Loss) Income	12	13	38	34
Atlantic City Electric Co [Member]
Operating Revenue
Total Operating Revenue	271	270	548	526
Operating Revenue	271	270	548	526
Operating Expenses
Purchased energy	154	163	311	329
Other operation and maintenance	58	56	119	112
Depreciation and amortization	32	27	63	55
Other taxes	2	4	6	8
Deferred electric service costs	(4)	(20)	(3)	(35)
Total Operating Expenses	242	230	496	469
Operating Income	29	40	52	57
Other Income (Expenses)
Interest expense	(18)	(18)	(35)	(35)
Other income		1		2
Total Other Expenses	(18)	(17)	(35)	(33)
Income (Loss) from Continuing Operations Before Income Tax Expense	11	23	17	24
Income Tax Expense Related to Continuing Operations	4	9	1	8
Net (Loss) Income	$ 7	$ 14	$ 16	$ 16