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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales and natural gas sales in the following segments:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(In millions)
Inter-segment Revenues
 
 
 
 
 
 
 
Electric
$
8

 
$
6

 
$
22

 
$
19

Gas
1

 
2

 
5

 
4

Gas Storage and Pipelines
1

 
(2
)
 
9

 
2

Power and Industrial Projects
211

 
231

 
593

 
621

Energy Trading
8

 
13

 
24

 
36

Corporate and Other
1

 
(8
)
 
2

 
(23
)
 
$
230

 
$
242

 
$
655

 
$
659



Financial data of the business segments follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(In millions)
Operating Revenues
 
 
 
 
 
 
 
Electric
$
1,358

 
$
1,458

 
$
4,049

 
$
3,942

Gas
149

 
161

 
1,182

 
1,013

Gas Storage and Pipelines
49

 
34

 
146

 
92

Power and Industrial Projects
605

 
512

 
1,703

 
1,431

Energy Trading
664

 
463

 
2,797

 
1,307

Corporate and Other
—

 
1

 
1

 
2

Reconciliation & Eliminations
(230
)
 
(242
)
 
(655
)
 
(659
)
Total
$
2,595

 
$
2,387

 
$
9,223

 
$
7,128
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric
$
135

 
$
179

 
$
400

 
$
383

Gas
(16
)
 
(13
)
 
109

 
91

Gas Storage and Pipelines
20

 
16

 
59

 
49

Power and Industrial Projects
38

 
27

 
66

 
46

Energy Trading
(22
)
 
(6
)
 
6

 
(1
)
Corporate and Other
1

 
(5
)
 
(34
)
 
(31
)
Net Income Attributable to DTE Energy Company
$
156

 
$
198

 
$
606

 
$
537