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Segment and Related Information (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
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,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Inter-segment Revenues
 
 
 
 
 
 
 
Electric
$
9

 
$
8

 
$
27

 
$
22

Gas
1

 
1

 
2

 
5

Gas Storage and Pipelines
1

 
1

 
7

 
9

Power and Industrial Projects
204

 
211

 
599

 
593

Energy Trading
7

 
8

 
23

 
24

Corporate and Other
1

 
1

 
2

 
2

 
$
223

 
$
230

 
$
660

 
$
655


Financial data of the DTE Energy business segments follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Operating Revenues
 
 
 
 
 
 
 
Electric
$
1,386

 
$
1,358

 
$
3,737

 
$
4,049

Gas
153

 
149

 
1,018

 
1,182

Gas Storage and Pipelines
61

 
49

 
175

 
146

Power and Industrial Projects
585

 
605

 
1,708

 
1,703

Energy Trading
635

 
664

 
1,870

 
2,797

Corporate and Other
1

 
—

 
2

 
1

Reconciliation and Eliminations
(223
)
 
(230
)
 
(660
)
 
(655
)
Total
$
2,598

 
$
2,595

 
$
7,850

 
$
9,223


Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric
$
214

 
$
135

 
$
449

 
$
400

Gas
(11
)
 
(16
)
 
93

 
109

Gas Storage and Pipelines
27

 
20

 
79

 
59

Power and Industrial Projects
32

 
38

 
73

 
66

Energy Trading
12

 
(22
)
 
—

 
6

Corporate and Other
(9
)
 
1

 
(47
)
 
(34
)
Net Income Attributable to DTE Energy Company
$
265

 
$
156

 
$
647

 
$
606