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Segment Information (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
(In millions)
 
 
 
 
Inter-segment Revenues
 
 
 
 
 
 
 
Electric
$
7

 
$
7

 
$
14

 
$
13

Gas
2

 
1

 
4

 
2

Gas Storage and Pipelines
7

 
2

 
8

 
4

Power and Industrial Projects
176

 
185

 
382

 
390

Energy Trading
7

 
12

 
16

 
23

Corporate and Other
(1
)
 
(7
)
 
1

 
(15
)
 
$
198

 
$
200

 
$
425

 
$
417



Financial data of the business segments follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
(In millions)
 
 
 
 
Operating Revenues
 
 
 
 
 
 
 
Electric
$
1,279

 
$
1,265

 
$
2,691

 
$
2,484

Gas
229

 
248

 
1,033

 
852

Gas Storage and Pipelines
45

 
31

 
97

 
58

Power and Industrial Projects
523

 
429

 
1,098

 
919

Energy Trading
819

 
451

 
2,133

 
844

Corporate & Other
1

 
1

 
1

 
1

Reconciliation & Eliminations
(198
)
 
(200
)
 
(425
)
 
(417
)
Total
$
2,698

 
$
2,225

 
$
6,628

 
$
4,741
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric
$
129

 
$
89

 
$
265

 
$
204

Gas
(4
)
 
8

 
125

 
104

Gas Storage and Pipelines
18

 
16

 
39

 
33

Power and Industrial Projects
13

 
7

 
28

 
19

Energy Trading
(14
)
 
(2
)
 
28

 
5

Corporate & Other
(18
)
 
(13
)
 
(35
)
 
(26
)
Net Income Attributable to DTE Energy
$
124

 
$
105

 
$
450

 
$
339