Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended June 30,										Six Months Ended June 30,
	2012					2011					2012					2011
	(millions of dollars)
Income tax at Federal statutory rate	$	34		35.0	%	$	52		35.0	%	$	63		35.0	%	$	86		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		5		5.3			6		4.0			10		5.4			11		4.5
Asset removal costs		(4	)	(4.0	)		(2	)	(1.3	)		(7	)	(3.8	)		(3	)	(1.2	)
Change in estimates and interest related to uncertain and effectively settled tax positions		3		2.8			(17	)	(11.4	)		(10	)	(5.8	)		(15	)	(6.1	)
Cross-border energy lease investments		(1	)	(1.1	)		21		14.1			(2	)	(1.2	)		20		8.2
State tax benefit related to prior years’ asset dispositions		—		—			(4	)	(2.7	)		—		—			(4	)	(1.6	)
Other, net		(2	)	(1.9	)		(2	)	(1.5	)		(5	)	(2.2	)		(7	)	(2.9	)
Consolidated income tax expense related to continuing operations	$	35		36.1	%	$	54		36.2	%	$	49		27.4	%	$	88		35.9	%

Potomac Electric Power Co [Member]

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended June 30,										Six Months Ended June 30,
	2012					2011					2012					2011
						(millions of dollars)
Income tax at Federal statutory rate	$	12		35.0	%	$	12		35.0	%	$	19		35.0	%	$	21		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		2		5.6			2		4.7			3		5.7			3		4.6
Asset removal costs		(4	)	(11.5	)		(2	)	(4.4	)		(7	)	(12.8	)		(3	)	(4.2	)
Change in estimates and interest related to uncertain and effectively settled tax positions		(1	)	(3.5	)		(4	)	(12.1	)		(11	)	(20.2	)		(4	)	(6.6	)
Permanent differences related to deferred compensation funding		—		(0.9	)		—		(1.2	)		(1	)	(0.9	)		(2	)	(2.5	)
State tax benefit related to prior years’ asset dispositions		—		—			(4	)	(12.4	)		—		—			(4	)	(7.1	)
Other, net		(1	)	(1.8	)		(2	)	(3.8	)		—		(1.2	)		(2	)	(3.9	)
Income tax expense	$	8		22.9	%	$	2		5.8	%	$	3		5.6	%	$	9		15.3	%

Delmarva Power & Light Co/De [Member]

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended June 30,									Six Months Ended June 30,
	2012				2011					2012				2011
	(millions of dollars)
Income tax at Federal statutory rate	$	8	35.0	%	$	10		35.0	%	$	20	35.0	%	$	24		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		1	5.1			1		5.2			3	5.4			4		6.0
Change in estimates and interest related to uncertain and effectively settled tax positions		—	—			(5	)	(18.5	)		—	(0.2	)		(5	)	(7.5	)
Deferred tax adjustment		—	—			(1	)	(3.7	)		—	—			(1	)	(1.5	)
Depreciation		—	0.5			1		3.7			—	—			1		1.5
Other, net		—	0.3			(1	)	(3.2	)		—	0.2			(1	)	(0.7	)
Income tax expense	$	9	40.9	%	$	5		18.5	%	$	23	40.4	%	$	22		32.8	%

Atlantic City Electric Co [Member]

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended June 30,								Six Months Ended June 30,
	2012				2011				2012					2011
	(millions of dollars)
Income tax at Federal statutory rate	$	8	35.0	%	$	11	35.0	%	$	8		35.0	%	$	15		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		1	4.2			2	6.6			1		4.0			3		7.0
Change in estimates and interest related to uncertain and effectively settled tax positions		—	0.8			—	1.3			(1	)	(4.0	)		1		1.4
Deferred tax adjustment		—	—			1	3.1			—		(0.4	)		1		2.3
Other, net		—	(0.9	)		—	(2.2	)		—		(1.3	)		(1	)	(1.5	)
Consolidated income tax expense	$	9	39.1	%	$	14	43.8	%	$	8		33.3	%	$	19		44.2	%