Property, Plant and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2014

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	March 31,			December 31,
	Life	2014			2013
Regulated assets:
Utility generation, distribution and transmission system	5-80 years	$	57,903		$	57,490
Interstate pipeline assets	3-80 years	6,498			6,448
		64,401			63,938
Accumulated depreciation and amortization		(20,258		)	(19,874		)
Regulated assets, net		44,143			44,064
Nonregulated assets:
Independent power plants	5-30 years	2,425			1,994
Other assets	3-30 years	574			522
		2,999			2,516
Accumulated depreciation and amortization		(714		)	(678		)
Nonregulated assets, net		2,285			1,838
Net operating assets		46,428			45,902
Construction work-in-progress		4,247			4,217
Property, plant and equipment, net		$	50,675		$	50,119