Property, Plant and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2013

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	June 30,			December 31,
	Life	2013			2012
Regulated assets:
Utility generation, distribution and transmission system	5-80 years	$	43,162		$	42,682
Interstate pipeline assets	3-80 years	6,357			6,354
		49,519			49,036
Accumulated depreciation and amortization		(15,760		)	(15,338		)
Regulated assets, net		33,759			33,698
Nonregulated assets:
Independent power plants	5-30 years	1,853			1,428
Other assets	3-30 years	458			432
		2,311			1,860
Accumulated depreciation and amortization		(618		)	(591		)
Nonregulated assets, net		1,693			1,269
Net operating assets		35,452			34,967
Construction work-in-progress		2,819			2,647
Property, plant and equipment, net		$	38,271		$	37,614