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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:
 
2014
 
2013
 
(In millions)
Property, Plant and Equipment
 
 
 
DTE Electric
 
 
 
Generation
$
11,641

 
$
11,127

Distribution
8,164

 
7,603

Total DTE Electric
19,805

 
18,730

DTE Gas
 
 
 
Distribution
2,946

 
2,834

Storage
448

 
431

Other
863

 
836

Total DTE Gas
4,257

 
4,101

Non-utility and other
2,476

 
2,292

Total
26,538

 
25,123

Less Accumulated Depreciation, Depletion and Amortization
 
 
 
DTE Electric
 
 
 
Generation
(4,149
)
 
(4,004
)
Distribution
(3,067
)
 
(2,947
)
Total DTE Electric
(7,216
)
 
(6,951
)
DTE Gas
 
 
 
Distribution
(1,130
)
 
(1,129
)
Storage
(142
)
 
(138
)
Other
(363
)
 
(338
)
Total DTE Gas
(1,635
)
 
(1,605
)
Non-utility and other
(867
)
 
(767
)
Total
(9,718
)
 
(9,323
)
Net Property, Plant and Equipment
$
16,820

 
$
15,800

The average estimated useful life for each major class of utility property, plant and equipment as of December 31, 2014 follows:
 
 
Estimated Useful Lives in Years
Utility
 
Generation
 
Distribution
 
Storage
Electric
 
40
 
41
 
N/A
Gas
 
N/A
 
50
 
53