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Property, Plant and Equipment, Net
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
(3)    Property, Plant and Equipment, Net

Property, plant and equipment, net consists of the following as of December 31 (in millions):
 
Depreciable
 
 
 
 
 
Life
 
2011
 
2010
Regulated assets:
 
 
 
 
 
Utility generation, distribution and transmission system
5-80 years
 
$
40,180

 
$
37,643

Interstate pipeline assets
3-80 years
 
6,245

 
5,906

 
 
 
46,425

 
43,549

Accumulated depreciation and amortization
 
 
(14,390
)
 
(13,711
)
Regulated assets, net
 
 
32,035

 
29,838

 
 
 
 
 
 
Nonregulated assets:
 
 
 
 
 
Independent power plants
5-30 years
 
677

 
678

Other assets
3-30 years
 
429

 
419

 
 
 
1,106

 
1,097

Accumulated depreciation and amortization
 
 
(533
)
 
(492
)
Nonregulated assets, net
 
 
573

 
605

 
 
 
 
 
 

Net operating assets
 
 
32,608

 
30,443

Construction work-in-progress
 
 
1,559

 
1,456

Property, plant and equipment, net
 
 
$
34,167

 
$
31,899


Substantially all of the construction work-in-progress as of December 31, 2011 and 2010 relates to the construction of regulated assets.