Consolidated Statements of Income (Loss) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Revenue	$ 4,878	$ 4,666	$ 4,625
Operating Expenses
Fuel and purchased energy	2,080	2,070	2,123
Other services cost of sales	207	146	170
Other operation and maintenance	924	851	898
Depreciation and amortization	549	473	454
Other taxes	413	428	432
Deferred electric service costs	20	26	(5)
Impairment losses	81	4	12
Total Operating Expenses	4,274	3,998	4,084
Operating Income (Loss)	604	668	541
Other Income (Expenses)
Interest and dividend income			1
Interest expense	(268)	(273)	(256)
Gain from equity investments		2	1
Impairment losses			(1)
Other income	44	32	35
Total Other Income (Expenses)	(224)	(239)	(220)
Income from Continuing Operations Before Income Tax Expense	380	429	321
Income Tax Expense Related to Continuing Operations	138	319	103
Net Income from Continuing Operations	242	110	218
(Loss) Income from Discontinued Operations, net of Income Taxes		(322)	67
Net Income (Loss)	242	(212)	285
Basic Share Information
Weighted average shares outstanding-Basic (millions)	251	246	229
Earnings per share of common stock from Continuing Operations-Basic	$ 0.96	$ 0.45	$ 0.95
(Loss) earnings per share of common stock from Discontinued Operations-Basic		$ (1.31)	$ 0.30
Earnings (loss) per share-Basic	$ 0.96	$ (0.86)	$ 1.25
Diluted Share Information
Weighted average shares outstanding-Diluted (millions)	252	246	230
Earnings per share of common stock from Continuing Operations-Diluted	$ 0.96	$ 0.45	$ 0.95
(Loss) earnings per share of common stock from Discontinued Operations-Diluted		$ (1.31)	$ 0.29
Earnings (loss) per share-Diluted	$ 0.96	$ (0.86)	$ 1.24
Potomac Electric Power Co [Member]
Operating Revenue
Total Operating Revenue	2,101	2,026	1,948
Operating Revenue	2,101	2,026	1,948
Operating Expenses
Fuel and purchased energy	771	750	726
Other operation and maintenance	390	391	403
Depreciation and amortization	229	196	190
Other taxes	363	368	372
Total Operating Expenses	1,753	1,705	1,691
Operating Income (Loss)	348	321	257
Other Income (Expenses)
Interest expense	(115)	(110)	(101)
Other income	30	18	18
Total Other Income (Expenses)	(85)	(92)	(83)
Income from Continuing Operations Before Income Tax Expense	263	229	174
Income Tax Expense Related to Continuing Operations	92	79	48
Net Income (Loss)	171	150	126
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	1,099	1,053	1,050
Natural gas	194	191	183
Total Operating Revenue	1,293	1,244	1,233
Operating Revenue	1,293	1,244	1,233
Operating Expenses
Fuel and purchased energy	546	552	568
Gas purchased	104	109	113
Other operation and maintenance	269	251	260
Depreciation and amortization	125	107	102
Other taxes	42	40	36
Total Operating Expenses	1,086	1,059	1,079
Operating Income (Loss)	207	185	154
Other Income (Expenses)
Interest expense	(48)	(50)	(47)
Other income	10	10	10
Total Other Income (Expenses)	(38)	(40)	(37)
Income from Continuing Operations Before Income Tax Expense	169	145	117
Income Tax Expense Related to Continuing Operations	65	56	44
Net Income (Loss)	104	89	73
Atlantic City Electric Co [Member]
Operating Revenue
Total Operating Revenue	1,213	1,202	1,198
Operating Revenue	1,213	1,202	1,198
Operating Expenses
Fuel and purchased energy	653	660	703
Other operation and maintenance	246	230	239
Depreciation and amortization	157	136	124
Other taxes	2	14	18
Deferred electric service costs	20	26	(5)
Total Operating Expenses	1,078	1,066	1,079
Operating Income (Loss)	135	136	119
Other Income (Expenses)
Interest expense	(63)	(68)	(70)
Other income	1	1	4
Total Other Income (Expenses)	(62)	(67)	(66)
Income from Continuing Operations Before Income Tax Expense	73	69	53
Income Tax Expense Related to Continuing Operations	28	19	18
Net Income (Loss)	$ 45	$ 50	$ 35