Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended September 30,										Nine Months Ended September 30,
	2012					2011					2012					2011
	(millions of dollars)
Income tax at Federal statutory rate	$	72		35.0	%	$	47		35.0	%	$	134		35.0	%	$	133		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		9		4.4			9		6.7			19		5.0			19		5.0
Asset removal costs		(1	)	(0.5	)		(2	)	(1.5	)		(8	)	(2.1	)		(4	)	(1.1	)
Change in estimates and interest related to uncertain and effectively settled tax positions		—		—			5		3.7			(10	)	(2.6	)		(11	)	(2.9	)
Cross-border energy lease investments		15		7.3			(5	)	(3.7	)		13		3.4			15		3.9
Other, net		(2	)	(0.8	)		1		0.5			(6	)	(1.7	)		(9	)	(2.3	)
Consolidated income tax expense related to continuing operations	$	93		45.4	%	$	55		40.7	%	$	142		37.0	%	$	143		37.6	%

Delmarva Power & Light Co/De [Member]

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended September 30,										Nine Months Ended September 30,
	2012					2011					2012					2011
	(millions of dollars)
Income tax at Federal statutory rate	$	12		35.0	%	$	7		35.0	%	$	32		35.0	%	$	31		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		2		6.1			1		5.2			5		5.6			5		5.3
Adjustments to prior year taxes		(2	)	(6.1	)		(1	)	(4.8	)		(2	)	(2.2	)		(1	)	(1.1	)
Change in estimates and interest related to uncertain and effectively settled tax positions		—		—			2		9.5			—		—			(3	)	(3.1	)
Depreciation		(1	)	(3.0	)		—		(0.5	)		(1	)	(1.1	)		—		—
Other, net		—		1.3			1		3.2			—		0.5			—		0.3
Income tax expense	$	11		33.3	%	$	10		47.6	%	$	34		37.8	%	$	32		36.4	%

Atlantic City Electric Co [Member]

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended September 30,									Nine Months Ended September 30,
	2012				2011					2012					2011
	(millions of dollars)
Income tax at Federal statutory rate	$	11	35.0	%	$	12		35.0	%	$	20		35.0	%	$	27		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		2	6.1			2		4.4			3		5.3			5		5.9
Change in estimates and interest related to uncertain and effectively settled tax positions		—	—			4		10.5			—		—			4		5.1
Deferred tax adjustment		—	—			—		—			—		—			1		1.7
Other, net		—	(1.7	)		(1	)	0.1			(2	)	(3.5	)		(1	)	(0.9	)
Consolidated income tax expense	$	13	39.4	%	$	17		50.0	%	$	21		36.8	%	$	36		46.8	%

Potomac Electric Power Co [Member]

Reconciliation Of Effective Income Tax Rate From Continuing Operations

	Three Months Ended September 30,										Nine Months Ended September 30,
	2012					2011					2012					2011
	(millions of dollars)
Income tax at Federal statutory rate	$	30		35.0	%	$	21		35.0	%	$	49		35.0	%	$	42		35.0	%
Increases (decreases) resulting from:
State income taxes, net of Federal effect		5		5.9			4		6.1			8		5.8			6		5.3
Asset removal costs		(1	)	(1.2	)		(2	)	(3.0	)		(8	)	(5.8	)		(4	)	(3.7	)
Change in estimates and interest related to uncertain and effectively settled tax positions		—		—			1		1.3			(11	)	(7.9	)		(4	)	(2.7	)
Permanent differences related to deferred compensation funding		—		—			—		(0.3	)		(1	)	(0.7	)		(2	)	(1.4	)
State tax benefit related to prior years’ asset dispositions		—		—			—		—			—		—			(4	)	(3.5	)
Tax credits		—		—			—		—			(1	)	(0.7	)		—		—
Other, net		1		1.5			(1	)	(1.4	)		2		1.6			(2	)	(2.3	)
Income tax expense	$	35		41.2	%	$	23		37.7	%	$	38		27.3	%	$	32		26.7	%