Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Operating Revenue
Power Delivery	$ 4,378		$ 4,650	$ 5,114
Pepco Energy Services	662		1,269	1,884
Other	41		32	42
Total Operating Revenue	5,081		5,951	7,040
Operating Expenses
Fuel and purchased energy	2,476		3,453	4,632
Other services cost of sales	170		172	140
Other operation and maintenance	911		914	884
Restructuring charge				30
Depreciation and amortization	454		426	393
Other taxes	432		451	434
Gains on early terminations of finance leases held in trust	(39)		(39)
Deferred electric service costs	(5)		(63)	(108)
Impairment losses	12
Effects of Pepco divestiture-related claims				11
Total operating expenses	4,411	[1]	5,314	6,416
Operating Income	670		637	624
OTHER INCOME (EXPENSES)
Interest and dividend income	1		1
Interest expense	(265)		(254)	(306)
Gain (loss) from equity investments	1		(3)	(1)
Loss on extinguishment of debt				(189)
Impairment losses	(1)		(5)
Other income	35		33	22
Total Other Expenses	(229)		(228)	(474)
Income Before Income Tax Expense	441		409	150
Income Tax Expense Related to Continuing Operations	156		149	11
Net Income from Continuing Operations	285		260	139
Loss from Discontinued Operations, net of Income Taxes	0		(3)	(107)
NET INCOME	285		257	32
Basic Share Information
Weighted average shares outstanding-Basic	229		226	224
Earnings per share of common stock from Continuing Operations - Basic	$ 1.25		$ 1.15	$ 0.62
Loss per share of common stock from Discontinued Operations - Basic			$ (0.01)	$ (0.48)
Earnings per share - Basic	$ 1.25		$ 1.14	$ 0.14
Diluted Share Information
Weighted average shares outstanding-Diluted	230		226	224
Earnings per share of common stock from Continuing Operations - Diluted	$ 1.24		$ 1.15	$ 0.62
Loss per share of common stock from Discontinued Operations - Diluted			$ (0.01)	$ (0.48)
Earnings per share - Diluted	$ 1.24		$ 1.14	$ 0.14
Potomac Electric Power Co [Member]
Operating Revenue
Total Operating Revenue	1,948		2,078	2,288
Operating Expenses
Purchased energy	726		893	1,152
Other operation and maintenance	403		420	354
Restructuring charge				15
Depreciation and amortization	190		171	162
Other taxes	372		382	364
Effects of Pepco divestiture-related claims				11
Total operating expenses	1,691		1,866	2,058
Operating Income	257		212	230
OTHER INCOME (EXPENSES)
Interest and dividend income				1
Interest expense	(101)		(94)	(98)
Other income	18		17	12
Total Other Expenses	(83)		(77)	(85)
Income Before Income Tax Expense	174		135	145
Income Tax Expense Related to Continuing Operations	48		36	37
NET INCOME	126		99	108
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	1,050		1,074	1,163
Natural gas	183		230	237
Total Operating Revenue	1,233		1,304	1,400
Operating Expenses
Purchased energy	568		635	740
Gas purchased	113		155	164
Other operation and maintenance	260		239	255
Restructuring charge				8
Depreciation and amortization	102		89	83
Other taxes	36		37	37
Total operating expenses	1,079		1,155	1,287
Operating Income	154		149	113
OTHER INCOME (EXPENSES)
Interest expense	(47)		(44)	(44)
Other income	10		8	7
Total Other Expenses	(37)		(36)	(37)
Income Before Income Tax Expense	117		113	76
Income Tax Expense Related to Continuing Operations	44		42	31
NET INCOME	73		71	45
Atlantic City Electric Co [Member]
Operating Revenue
Total Operating Revenue	1,198		1,268	1,430
Operating Expenses
Purchased energy	703		807	1,030
Other operation and maintenance	239		226	204
Restructuring charge				6
Depreciation and amortization	124		134	112
Other taxes	18		25	26
Deferred electric service costs	(5)		(63)	(108)
Total operating expenses	1,079		1,129	1,270
Operating Income	119		139	160
OTHER INCOME (EXPENSES)
Interest expense	(70)		(69)	(65)
Other income	4		2	1
Total Other Expenses	(66)		(67)	(64)
Income Before Income Tax Expense	53		72	96
Income Tax Expense Related to Continuing Operations	18		33	43
NET INCOME	$ 35		$ 39	$ 53

[1] Includes impairment losses of $12 million pre-tax ($7 million after-tax) at Pepco Energy Services associated primarily with investments in landfill gas-fired electric generation facilities, and the combustion turbines at Buzzard Point.