Property, Plant and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2015

Property, Plant and Equipment, Net [Abstract]

Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]

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

		As of
		June 30,			December 31,
	Depreciable Life	2015			2014
Property, plant and equipment in-service	5-75 years	$	26,503		$	25,813
Accumulated depreciation and amortization		(8,247		)	(8,026		)
Net property, plant and equipment in-service		18,256			17,787
Construction work-in-progress		644			932
Total property, plant and equipment, net		$	18,900		$	18,719