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Segment and Related Information (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Inter-segment Revenues
 
 
 
 
 
 
 
Electric
$
9

 
$
7

 
$
18

 
$
14

Gas
—

 
2

 
1

 
4

Gas Storage and Pipelines
5

 
7

 
6

 
8

Power and Industrial Projects
215

 
176

 
395

 
382

Energy Trading
7

 
7

 
16

 
16

Corporate and Other
—

 
(1
)
 
1

 
1

 
$
236

 
$
198

 
$
437

 
$
425


Financial data of the DTE Energy business segments follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Operating Revenues
 
 
 
 
 
 
 
Electric
$
1,148

 
$
1,279

 
$
2,351

 
$
2,691

Gas
218

 
229

 
865

 
1,033

Gas Storage and Pipelines
57

 
45

 
114

 
97

Power and Industrial Projects
556

 
523

 
1,123

 
1,098

Energy Trading
524

 
819

 
1,235

 
2,133

Corporate and Other
1

 
1

 
1

 
1

Reconciliation and Eliminations
(236
)
 
(198
)
 
(437
)
 
(425
)
Total
$
2,268

 
$
2,698

 
$
5,252

 
$
6,628


Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric
$
99

 
$
129

 
$
235

 
$
265

Gas
(7
)
 
(4
)
 
104

 
125

Gas Storage and Pipelines
25

 
18

 
52

 
39

Power and Industrial Projects
8

 
13

 
41

 
28

Energy Trading
(3
)
 
(14
)
 
(12
)
 
28

Corporate and Other
(13
)
 
(18
)
 
(38
)
 
(35
)
Net Income Attributable to DTE Energy Company
$
109

 
$
124

 
$
382

 
$
450