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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Summary of property by classification as of December 31:
 
2013
 
2012
 
(In millions)
Property, Plant and Equipment
 
 
 
Generation
$
11,127

 
$
10,383

Distribution
7,603

 
7,306

Total
18,730

 
17,689

Less Accumulated Depreciation and Amortization
 
 
 
Generation
(4,004
)
 
(3,880
)
Distribution
(2,947
)
 
(2,837
)
Total
(6,951
)
 
(6,717
)
Net Property, Plant and Equipment
$
11,779

 
$
10,972