Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]



	2012			2011
Property, Plant and Equipment	(In millions)
Electric
Generation	$	10,383		$	9,785
Distribution	7,306			7,003
Total Electric	17,689			16,788
Gas
Distribution	2,735			2,561
Storage	434			406
Other	852			902
Total Gas	4,021			3,869
Non-utility and other	1,921			1,884
Total	23,631			22,541
Less Accumulated Depreciation, Depletion and Amortization
Electric
Generation	(3,880		)	(3,946		)
Distribution	(2,837		)	(2,580		)
Total Electric	(6,717		)	(6,526		)
Gas
Distribution	(1,075		)	(1,041		)
Storage	(133		)	(127		)
Other	(363		)	(413		)
Total Gas	(1,571		)	(1,581		)
Non-utility and other	(659		)	(688		)
Total	(8,947		)	(8,795		)
Net Property, Plant and Equipment	$	14,684		$	13,746

Useful Life [Table Text Block]

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details

Estimated Useful Lives in Years

Generation

Distribution