Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2012

Property, Plant and Equipment, Net [Abstract]

Property, Plant and Equipment [Table Text Block]

Property, plant and equipment, net consists of the following (in millions):

		As of
	Depreciable	September 30,			December 31,
	Life	2012			2011
Regulated assets:
Utility generation, distribution and transmission system	5-80 years	$	41,813		$	40,180
Interstate pipeline assets	3-80 years	6,323			6,245
		48,136			46,425
Accumulated depreciation and amortization		(15,125		)	(14,390		)
Regulated assets, net		33,011			32,035
Nonregulated assets:
Independent power plants	5-30 years	677			677
Other assets	3-30 years	452			429
		1,129			1,106
Accumulated depreciation and amortization		(575		)	(533		)
Nonregulated assets, net		554			573
Net operating assets		33,565			32,608
Construction work-in-progress		2,639			1,559
Property, plant and equipment, net		$	36,204		$	34,167