Consolidated Statements of Income (Loss) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenue	$ 1,344	$ 1,389	$ 3,575	$ 3,569
Operating Expenses
Fuel and purchased energy	579	648	1,587	1,658
Other services cost of sales	37	38	112	132
Other operation and maintenance	208	228	647	668
Depreciation and amortization	124	122	352	343
Other taxes	119	121	325	330
Deferred electric service costs	42	29	39	(6)
Impairment losses		2		5
Total Operating Expenses	1,109	1,188	3,062	3,130
Operating Income	235	201	513	439
Other Income (Expenses)
Interest Expense	(68)	(66)	(205)	(190)
Other income	8	9	24	27
Total Other Expenses	(60)	(57)	(181)	(163)
Income from Continuing Operations Before Income Tax Expense	175	144	332	276
Income Tax Expense Related to Continuing Operations	65	57	280	92
Net Income from Continuing Operations	110	87	52	184
Income (Loss) from Discontinued Operations, Net of Income Taxes	8	25	(322)	58
Net Income (Loss)	118	112	(270)	242
Basic and Diluted Share Information
Weighted average shares outstanding - Basic	249	229	245	228
Weighted average shares outstanding - Diluted	249	231	245	229
Earnings per share of common stock from Continuing Operations - Basic and Diluted	$ 0.44	$ 0.38	$ 0.21	$ 0.80
Earnings (Loss) per share of common stock from Discontinued Operations - Basic and Diluted	$ 0.04	$ 0.11	$ (1.31)	$ 0.26
Basic and Diluted earnings (loss) per share	$ 0.48	$ 0.49	$ (1.10)	$ 1.06
Potomac Electric Power Co [Member]
Operating Revenue
Operating Revenue	605	582	1,551	1,503
Operating Expenses
Purchased energy	227	227	576	572
Other operation and maintenance	95	97	292	301
Depreciation and amortization	51	48	147	143
Other taxes	103	103	280	285
Total Operating Expenses	476	475	1,295	1,301
Operating Income	129	107	256	202
Other Income (Expenses)
Interest Expense	(28)	(27)	(82)	(76)
Other income	5	5	14	13
Total Other Expenses	(23)	(22)	(68)	(63)
Income from Continuing Operations Before Income Tax Expense	106	85	188	139
Income Tax Expense Related to Continuing Operations	40	35	62	38
Net Income (Loss)	66	50	126	101
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	273	314	795	808
Natural gas	23	26	137	124
Operating Revenue	296	340	932	932
Operating Expenses
Purchased energy	142	178	422	443
Gas purchased	11	15	80	77
Other operation and maintenance	59	65	191	192
Depreciation and amortization	27	29	79	78
Other taxes	10	10	29	26
Total Operating Expenses	249	297	801	816
Operating Income	47	43	131	116
Other Income (Expenses)
Interest Expense	(13)	(12)	(38)	(34)
Other income	3	2	7	8
Total Other Expenses	(10)	(10)	(31)	(26)
Income from Continuing Operations Before Income Tax Expense	37	33	100	90
Income Tax Expense Related to Continuing Operations	14	11	39	34
Net Income (Loss)	23	22	61	56
Atlantic City Electric Co [Member]
Operating Revenue
Operating Revenue	396	413	944	939
Operating Expenses
Purchased energy	198	226	509	555
Other operation and maintenance	58	66	177	178
Depreciation and amortization	38	37	101	92
Other taxes	5	6	11	14
Deferred electric service costs	42	29	39	(6)
Total Operating Expenses	341	364	837	833
Operating Income	55	49	107	106
Other Income (Expenses)
Interest Expense	(17)	(17)	(52)	(52)
Other income		1		3
Total Other Expenses	(17)	(16)	(52)	(49)
Income from Continuing Operations Before Income Tax Expense	38	33	55	57
Income Tax Expense Related to Continuing Operations	13	13	14	21
Net Income (Loss)	$ 25	$ 20	$ 41	$ 36