Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Revenue	$ 1,362	$ 1,313	$ 3,873	$ 3,760
Operating Expenses
Fuel and purchased energy	580	545	1,651	1,622
Other services cost of sales	37	54	131	161
Other operation and maintenance	257	242	772	679
Depreciation and amortization	178	145	494	410
Other taxes	114	109	327	315
Deferred electric service costs	13	(1)	34	30
Impairment loss		53		53
Total Operating Expenses	1,179	1,147	3,409	3,270
Operating Income	183	166	464	490
Other Income (Expenses)
Interest expense	(71)	(68)	(210)	(200)
Other income	28	15	49	42
Total Other Expenses	(43)	(53)	(161)	(158)
Income Before Income Tax Expense	140	113	303	332
Income Tax Expense	49	34	106	125
Net Income	$ 91	$ 79	$ 197	$ 207
Basic and Diluted Share Information
Weighted average shares outstanding - Basic (millions)	254	252	253	251
Weighted average shares outstanding - Diluted (millions)	254	252	254	252
Basic and Diluted earnings per share	$ 0.36	$ 0.31	$ 0.78	$ 0.82
Potomac Electric Power Co [Member]
Operating Revenue
Operating Revenue	$ 612	$ 587	$ 1,686	$ 1,630
Operating Expenses
Fuel and purchased energy	213	205	606	612
Other operation and maintenance	112	103	328	287
Depreciation and amortization	74	59	207	171
Other taxes	98	95	284	275
Total Operating Expenses	497	462	1,425	1,345
Operating Income	115	125	261	285
Other Income (Expenses)
Interest expense	(31)	(29)	(92)	(86)
Other income	8	9	21	28
Total Other Expenses	(23)	(20)	(71)	(58)
Income Before Income Tax Expense	92	105	190	227
Income Tax Expense	32	38	62	82
Net Income	60	67	128	145
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	298	289	885	840
Natural gas	19	20	130	145
Operating Revenue	317	309	1,015	985
Operating Expenses
Fuel and purchased energy	146	140	444	422
Gas purchased	8	9	66	80
Other operation and maintenance	77	71	235	202
Depreciation and amortization	42	33	117	93
Other taxes	12	11	35	32
Total Operating Expenses	285	264	897	829
Operating Income	32	45	118	156
Other Income (Expenses)
Interest expense	(12)	(12)	(37)	(35)
Other income	4	3	9	9
Total Other Expenses	(8)	(9)	(28)	(26)
Income Before Income Tax Expense	24	36	90	130
Income Tax Expense	9	13	35	51
Net Income	15	23	55	79
Atlantic City Electric Co [Member]
Operating Revenue
Operating Revenue	387	347	1,006	940
Operating Expenses
Fuel and purchased energy	214	188	535	504
Other operation and maintenance	72	65	209	178
Depreciation and amortization	49	42	135	117
Other taxes	1	1	3	3
Deferred electric service costs	13	(1)	34	30
Total Operating Expenses	349	295	916	832
Operating Income	38	52	90	108
Other Income (Expenses)
Interest expense	(17)	(16)	(49)	(47)
Other income		1	3	2
Total Other Expenses	(17)	(15)	(46)	(45)
Income Before Income Tax Expense	21	37	44	63
Income Tax Expense	7	14	16	24
Net Income	$ 14	$ 23	$ 28	$ 39