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Segment Information
 9 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
SEGMENT INFORMATION
SEGMENT AND RELATED INFORMATION

The Company sets strategic goals, allocates resources and evaluates performance based on the following structure:

Electric Utility segment consists principally of Detroit Edison, which is engaged in the generation, purchase, distribution and sale of electricity to approximately 2.1 million residential, commercial and industrial customers in southeastern Michigan.

Gas Utility segment consists of MichCon and Citizens.  MichCon is engaged in the purchase, storage, transportation, distribution and sale of natural gas to approximately 1.2 million residential, commercial and industrial customers throughout Michigan and the sale of storage and transportation capacity. Citizens distributes natural gas in Adrian, Michigan to approximately 17,000 customers.

Gas Storage and Pipelines consists of natural gas pipeline, gathering and storage businesses.

Unconventional Gas Production is engaged in unconventional gas and oil project development and production.

Power and Industrial Projects is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial and institutional customers; provide coal transportation and marketing; and sell electricity from biomass-fired energy projects.

Energy Trading consists of energy marketing and trading operations.

Corporate and Other includes various holding company activities, holds certain non-utility debt and energy-related investments.

The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of production tax credits and net operating losses if applicable. The subsidiaries record federal and state income taxes payable to or receivable from DTE Energy based on the federal and state tax provisions of each company.

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 fuels, power sales, gas sales and coal transportation services in the following segments (in millions):
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2012
 
2011
 
2012
 
2011
Electric Utility
$
7

 
$
7

 
$
22

 
$
25

Gas Utility
1

 
1

 
3

 
2

Gas Storage and Pipelines
1

 
1

 
5

 
7

Unconventional Gas Production
1

 
—

 
1

 
—

Power and Industrial Projects
225

 
30

 
608

 
119

Energy Trading
10

 
17

 
34

 
54

Corporate and Other
(11
)
 
(12
)
 
(28
)
 
(40
)
 
$
234

 
$
44

 
$
645

 
$
167



Financial data of the business segments follows (in millions):
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2012
 
2011
 
2012
 
2011
Operating Revenues
 
 
 
 
 
 
 
Electric Utility
$
1,543

 
$
1,517

 
$
4,031

 
$
3,950

Gas Utility
160

 
159

 
883

 
1,090

Gas Storage and Pipelines
21

 
21

 
73

 
69

Unconventional Gas Production
16

 
11

 
38

 
29

Power and Industrial Projects
477

 
259

 
1,375

 
781

Energy Trading
223

 
342

 
723

 
970

Corporate and Other
—

 
—

 
2

 
2

Reconciliation & Eliminations
(234
)
 
(44
)
 
(645
)
 
(167
)
Total
$
2,206

 
$
2,265

 
$
6,480

 
$
6,724

 
 
 
 
 
 
 
 
Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric Utility
$
194

 
$
157

 
$
417

 
$
345

Gas Utility
4

 
(11
)
 
60

 
69

Gas Storage and Pipelines
14

 
13

 
48

 
42

Unconventional Gas Production
—

 
(2
)
 
(3
)
 
(5
)
Power and Industrial Projects
22

 
12

 
40

 
27

Energy Trading
1

 
22

 
3

 
36

Corporate and Other (a)
(8
)
 
(8
)
 
(36
)
 
47

Net Income Attributable to DTE Energy
$
227

 
$
183

 
$
529

 
$
561


_____________________________
(a)
The 2011 net income for Corporate and Other includes an income tax benefit of $88 million related to the enactment of the MCIT in the second quarter of 2011.