Property, Plant and Equipment, Net Property, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment, Net [Abstract]

Property, Plant, and Equipment, Net [Table Text Block]

Property, plant and equipment, net consists of the following as of December 31 (in millions):

	Depreciable Life	2014			2013
Property, plant and equipment:
Generation	10 - 67 years	$	11,932		$	11,058
Transmission	58 - 75 years	5,392			5,235
Distribution	20 - 70 years	6,197			6,030
Intangible plant(1)	5 - 65 years	879			857
Other	5 - 60 years	1,413			1,688
Property, plant and equipment in-service		25,813			24,868
Accumulated depreciation and amortization		(8,026		)	(7,686		)
Net property, plant and equipment in-service		17,787			17,182
Construction work-in-progress		932			1,325
Total property, plant and equipment, net		$	18,719		$	18,507

(1) Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.