Consolidated Statements of (Loss) Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Revenue	$ 4,666	$ 4,625	$ 4,964
Operating Expenses
Fuel and purchased energy	2,070	2,123	2,537
Other services cost of sales	146	170	172
Other operation and maintenance	851	898	889
Depreciation and amortization	473	454	425
Other taxes	428	432	451
Deferred electric service costs	26	(5)	(63)
Impairment losses	4	12
Total Operating Expenses	3,998	4,084	4,411
Operating (Loss) Income	668	541	553
Other Income (Expenses)
Interest and dividend income		1	1
Interest expense	(273)	(256)	(242)
Gain (loss) from equity investments	2	1	(3)
Impairment losses		(1)	(5)
Other income	32	35	32
Total Other Expenses	(239)	(220)	(217)
Income Before Income Tax Expense	429	321	336
Income Tax Expense	319	103	114
Net Income from continuing operations	110	218	222
(Loss) Income from Discontinued Operations, net of Income Taxes	(322)	67	35
Net (Loss) Income	(212)	285	257
Basic Share Information
Weighted average shares outstanding-Basic (millions)	246	229	226
Earnings per share of common stock from Continuing Operations-Basic	$ 0.45	$ 0.95	$ 0.98
(Loss) earnings per share of common stock from Discontinued Operations-Basic	$ (1.31)	$ 0.30	$ 0.16
(Loss) earnings per share-Basic	$ (0.86)	$ 1.25	$ 1.14
Diluted Share Information
Weighted average shares outstanding-Diluted (millions)	246	230	226
Earnings per share of common stock from Continuing Operations-Diluted	$ 0.45	$ 0.95	$ 0.98
(Loss) earnings per share of common stock from Discontinued Operations-Diluted	$ (1.31)	$ 0.29	$ 0.16
(Loss) earnings per share-Diluted	$ (0.86)	$ 1.24	$ 1.14
Potomac Electric Power Co [Member]
Operating Revenue
Operating Revenue	2,026	1,948	2,078
Operating Expenses
Fuel and purchased energy	750	726	893
Other operation and maintenance	391	403	420
Depreciation and amortization	196	190	171
Other taxes	368	372	382
Total Operating Expenses	1,705	1,691	1,866
Operating (Loss) Income	321	257	212
Other Income (Expenses)
Interest expense	(110)	(101)	(94)
Other income	18	18	17
Total Other Expenses	(92)	(83)	(77)
Income Before Income Tax Expense	229	174	135
Income Tax Expense	79	48	36
Net (Loss) Income	150	126	99
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	1,053	1,050	1,074
Natural gas	191	183	230
Operating Revenue	1,244	1,233	1,304
Operating Expenses
Fuel and purchased energy	552	568	635
Gas purchased	109	113	155
Other operation and maintenance	251	260	239
Depreciation and amortization	107	102	89
Other taxes	40	36	37
Total Operating Expenses	1,059	1,079	1,155
Operating (Loss) Income	185	154	149
Other Income (Expenses)
Interest expense	(50)	(47)	(44)
Other income	10	10	8
Total Other Expenses	(40)	(37)	(36)
Income Before Income Tax Expense	145	117	113
Income Tax Expense	56	44	42
Net (Loss) Income	89	73	71
Atlantic City Electric Co [Member]
Operating Revenue
Operating Revenue	1,202	1,198	1,268
Operating Expenses
Fuel and purchased energy	660	703	807
Other operation and maintenance	230	239	226
Depreciation and amortization	136	124	134
Other taxes	14	18	25
Deferred electric service costs	26	(5)	(63)
Total Operating Expenses	1,066	1,079	1,129
Operating (Loss) Income	136	119	139
Other Income (Expenses)
Interest expense	(68)	(70)	(69)
Other income	1	4	2
Total Other Expenses	(67)	(66)	(67)
Income Before Income Tax Expense	69	53	72
Income Tax Expense	19	18	33
Net (Loss) Income	$ 50	$ 35	$ 39