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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Summary of property by classification as of December 31:
 
December 31,
 
2014
 
2013
 
(In millions)
Property, Plant and Equipment
 
 
 
Generation
$
11,641

 
$
11,127

Distribution
8,164

 
7,603

Total
19,805

 
18,730

Less Accumulated Depreciation and Amortization
 
 
 
Generation
(4,149
)
 
(4,004
)
Distribution
(3,067
)
 
(2,947
)
Total
(7,216
)
 
(6,951
)
Net Property, Plant and Equipment
$
12,589

 
$
11,779