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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
Property, Plant and Equipment
(In millions)
DTE Electric
 
 
 
Generation
$
11,127

 
$
10,383

Distribution
7,603

 
7,306

Total DTE Electric
18,730

 
17,689

DTE Gas
 
 
 
Distribution
2,834

 
2,704

Storage
431

 
426

Other
836

 
852

Total DTE Gas
4,101

 
3,982

Non-utility and other
2,292

 
1,960

Total
25,123

 
23,631

Less Accumulated Depreciation, Depletion and Amortization
 
 
 
DTE Electric
 
 
 
Generation
(4,004
)
 
(3,880
)
Distribution
(2,947
)
 
(2,837
)
Total DTE Electric
(6,951
)
 
(6,717
)
DTE Gas
 
 
 
Distribution
(1,129
)
 
(1,057
)
Storage
(138
)
 
(132
)
Other
(338
)
 
(365
)
Total DTE Gas
(1,605
)
 
(1,554
)
Non-utility and other
(767
)
 
(676
)
Total
(9,323
)
 
(8,947
)
Net Property, Plant and Equipment
$
15,800

 
$
14,684
Useful Life [Table Text Block]
The average estimated useful life for each major class of utility property, plant and equipment as of December 31, 2013 follows:
 
 
Estimated Useful Lives in Years
Utility
 
Generation
 
Distribution
 
Storage
Electric
 
40
 
41
 
N/A
Gas
 
N/A
 
50
 
53