Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Property, Plant And Equipment

	Original Cost		Accumulated Depreciation		Net Book Value
	(millions of dollars)
At December 31, 2012
Generation	$	107	$	97	$	10
Distribution		8,320		2,954		5,366
Transmission		2,783		866		1,917
Gas		458		137		321
Construction work in progress		692		—		692
Non-operating and other property		1,265		725		540
Total	$	13,625	$	4,779	$	8,846
At December 31, 2011
Generation	$	108	$	82	$	26
Distribution		7,832		2,848		4,984
Transmission		2,462		834		1,628
Gas		429		133		296
Construction work in progress		742		—		742
Non-operating and other property		1,282		738		544
Total	$	12,855	$	4,635	$	8,220

Potomac Electric Power Co [Member]

Schedule Of Property, Plant And Equipment

	Original Cost		Accumulated Depreciation		Net Book Value
	(millions of dollars)
At December 31, 2012
Distribution	$	4,949	$	1,995	$	2,954
Transmission		1,166		419		747
Construction work in progress		303		—		303
Non-operating and other property		432		291		141
Total	$	6,850	$	2,705	$	4,145
At December 31, 2011
Distribution	$	4,661	$	1,960	$	2,701
Transmission		986		398		588
Construction work in progress		438		—		438
Non-operating and other property		493		346		147
Total	$	6,578	$	2,704	$	3,874

Atlantic City Electric Co [Member]

Schedule Of Property, Plant And Equipment

	Original Cost		Accumulated Depreciation		Net Book Value
	(millions of dollars)
At December 31, 2012
Generation	$	10	$	9	$	1
Distribution		1,707		461		1,246
Transmission		740		214		526
Construction work in progress		133		—		133
Non-operating and other property		181		103		78
Total	$	2,771	$	787	$	1,984
At December 31, 2011
Generation	$	10	$	9	$	1
Distribution		1,591		453		1,138
Transmission		688		206		482
Construction work in progress		87		—		87
Non-operating and other property		172		98		74
Total	$	2,548	$	766	$	1,782

Delmarva Power & Light Co/De [Member]

Schedule Of Property, Plant And Equipment

	Original Cost		Accumulated Depreciation		Net Book Value
	(millions of dollars)
At December 31, 2012
Distribution	$	1,664	$	498	$	1,166
Transmission		877		233		644
Gas		458		137		321
Construction work in progress		206		—		206
Non-operating and other property		217		132		85
Total	$	3,422	$	1,000	$	2,422
At December 31, 2011
Distribution	$	1,580	$	435	$	1,145
Transmission		788		230		558
Gas		429		133		296
Construction work in progress		151		—		151
Non-operating and other property		240		128		112
Total	$	3,188	$	926	$	2,262