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Segment Information (Tables)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Inter segment billing for goods and services [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 power sales, gas sales and coal transportation services in the following segments:

 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
(in Millions)
2011
 
2010
 
2011
 
2010
Electric Utility
$
7

 
$
8

 
$
25

 
$
23

Gas Utility
1

 
1

 
2

 
1

Gas Storage and Pipelines
1

 
1

 
7

 
3

Power and Industrial Projects
30

 
50

 
119

 
122

Energy Trading
17

 
21

 
54

 
65

Corporate & Other
(12
)
 
(18
)
 
(40
)
 
(51
)
 
$
44

 
$
63

 
$
167

 
$
163

Schedule of Segment Reporting Information, by Segment [Table Text Block]
Financial data of the business segments follows:

 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
(in Millions)
2011
 
2010
 
2011
 
2010
Operating Revenues
 
 
 
 
 
 
 
Electric Utility
$
1,517

 
$
1,444

 
$
3,950

 
$
3,798

Gas Utility
159

 
170

 
1,090

 
1,157

Gas Storage and Pipelines
21

 
20

 
69

 
62

Unconventional Gas Production
11

 
7

 
29

 
23

Power and Industrial Projects
259

 
303

 
781

 
846

Energy Trading
342

 
258

 
970

 
661

Corporate & Other
—

 
—

 
2

 
—

Reconciliation & Eliminations
(44
)
 
(63
)
 
(167
)
 
(163
)
Total
$
2,265

 
$
2,139

 
$
6,724

 
$
6,384

Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric Utility
$
157

 
$
165

 
$
345

 
$
343

Gas Utility
(11
)
 
(6
)
 
69

 
92

Gas Storage and Pipelines
13

 
12

 
42

 
36

Unconventional Gas Production
(2
)
 
(4
)
 
(5
)
 
(9
)
Power and Industrial Projects
12

 
26

 
27

 
66

Energy Trading
22

 
(12
)
 
36

 
—

Corporate & Other (1)
(8
)
 
(18
)
 
47

 
(50
)
Net Income Attributable to DTE Energy
$
183

 
$
163

 
$
561

 
$
478