Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Summary of property by classification as of December 31:

	2012			2011
Property, Plant and Equipment	(In millions)
Generation	$	10,383		$	9,785
Distribution	7,306			7,003
Total	17,689			16,788
Less Accumulated Depreciation and Amortization
Generation	(3,880		)	(3,946		)
Distribution	(2,837		)	(2,580		)
Total	(6,717		)	(6,526		)
Net Property, Plant and Equipment	$	10,972		$	10,262