Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Revenue	$ 5,023	$ 4,878	$ 4,666
Operating Expenses
Fuel and purchased energy	2,097	2,080	2,070
Other services cost of sales	175	207	146
Other operation and maintenance	1,016	924	851
Depreciation and amortization	651	549	473
Other taxes	427	413	428
Deferred electric service costs	30	20	26
Impairment losses		81	4
Gains on sales of land	(46)
Total Operating Expenses	4,350	4,274	3,998
Operating Income (Loss)	673	604	668
Other Income (Expenses)
Interest expense	(280)	(268)	(273)
Gain from equity investments			2
Other income	54	44	32
Total Other Income (Expenses)	(226)	(224)	(239)
Income from Continuing Operations Before Income Tax Expense	447	380	429
Income Tax Expense Related to Continuing Operations	129	138	319
Net Income (Loss) from Continuing Operations	318	242	110
Income (Loss) from Discontinued Operations, net of Income Taxes	9		(322)
Net Income (Loss)	$ 327	$ 242	$ (212)
Basic Share Information
Weighted average shares outstanding - Basic (millions)	253	251	246
Earnings per share of common stock from Continuing Operations - Basic	$ 1.25	$ 0.96	$ 0.45
Earnings (loss) per share of common stock from Discontinued Operations - Basic	0.04		(1.31)
Earnings (loss) per share - Basic	$ 1.29	$ 0.96	$ (0.86)
Diluted Share Information
Weighted average shares outstanding - Diluted (millions)	254	252	246
Earnings per share of common stock from Continuing Operations - Diluted	$ 1.25	$ 0.96	$ 0.45
Earnings (loss) per share of common stock from Discontinued Operations - Diluted	0.04		(1.31)
Earnings (loss) per share - Diluted	$ 1.29	$ 0.96	$ (0.86)
Potomac Electric Power Co [Member]
Operating Revenue
Total Operating Revenue	$ 2,189	$ 2,101	$ 2,026
Operating Revenue	2,189	2,101	2,026
Operating Expenses
Fuel and purchased energy	763	771	750
Other operation and maintenance	441	390	391
Depreciation and amortization	277	229	196
Other taxes	369	363	368
Gains on sales of land	(46)
Total Operating Expenses	1,804	1,753	1,705
Operating Income (Loss)	385	348	321
Other Income (Expenses)
Interest expense	(123)	(115)	(110)
Other income	23	30	18
Total Other Income (Expenses)	(100)	(85)	(92)
Income from Continuing Operations Before Income Tax Expense	285	263	229
Income Tax Expense Related to Continuing Operations	98	92	79
Net Income (Loss)	187	171	150
Delmarva Power & Light Co/De [Member]
Operating Revenue
Electric	1,153	1,099	1,053
Natural gas	165	194	191
Total Operating Revenue	1,318	1,293	1,244
Operating Revenue	1,318	1,293	1,244
Operating Expenses
Fuel and purchased energy	568	546	552
Gas purchased	79	104	109
Other operation and maintenance	306	269	251
Depreciation and amortization	153	125	107
Other taxes	47	42	40
Total Operating Expenses	1,153	1,086	1,059
Operating Income (Loss)	165	207	185
Other Income (Expenses)
Interest expense	(50)	(48)	(50)
Other income	10	10	10
Total Other Income (Expenses)	(40)	(38)	(40)
Income from Continuing Operations Before Income Tax Expense	125	169	145
Income Tax Expense Related to Continuing Operations	49	65	56
Net Income (Loss)	76	104	89
Atlantic City Electric Co [Member]
Operating Revenue
Total Operating Revenue	1,298	1,213	1,202
Operating Revenue	1,298	1,213	1,202
Operating Expenses
Fuel and purchased energy	685	653	660
Other operation and maintenance	272	246	230
Depreciation and amortization	176	157	136
Other taxes	5	2	14
Deferred electric service costs	30	20	26
Total Operating Expenses	1,168	1,078	1,066
Operating Income (Loss)	130	135	136
Other Income (Expenses)
Interest expense	(64)	(63)	(68)
Other income	3	1	1
Total Other Income (Expenses)	(61)	(62)	(67)
Income from Continuing Operations Before Income Tax Expense	69	73	69
Income Tax Expense Related to Continuing Operations	31	28	19
Net Income (Loss)	$ 38	$ 45	$ 50