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Segment Information
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30
 
June 30
 
2012
 
2011
 
2012
 
2011
Electric Utility
$
8

 
$
9

 
$
15

 
$
18

Gas Utility
1

 
1

 
2

 
1

Gas Storage and Pipelines
3

 
4

 
4

 
6

Power and Industrial Projects
192

 
63

 
383

 
89

Energy Trading
10

 
15

 
24

 
37

Corporate and Other
(7
)
 
(11
)
 
(17
)
 
(28
)
 
$
207

 
$
81

 
$
411

 
$
123



Financial data of the business segments follows (in millions):
 
Three Months Ended
 
Six Months Ended
 
June 30
 
June 30
 
2012
 
2011
 
2012
 
2011
Operating Revenues
 
 
 
 
 
 
 
Electric Utility
$
1,290

 
$
1,240

 
$
2,488

 
$
2,433

Gas Utility
214

 
242

 
723

 
931

Gas Storage and Pipelines
27

 
23

 
52

 
48

Unconventional Gas Production
12

 
10

 
22

 
18

Power and Industrial Projects
449

 
287

 
898

 
522

Energy Trading
239

 
306

 
500

 
628

Corporate and Other
1

 
1

 
2

 
2

Reconciliation & Eliminations
(207
)
 
(81
)
 
(411
)
 
(123
)
Total
$
2,025

 
$
2,028

 
$
4,274

 
$
4,459

 
 
 
 
 
 
 
 
Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric Utility
$
127

 
$
103

 
$
223

 
$
188

Gas Utility
4

 
(3
)
 
56

 
80

Gas Storage and Pipelines
17

 
14

 
34

 
29

Unconventional Gas Production
(2
)
 
(1
)
 
(3
)
 
(3
)
Power and Industrial Projects
10

 
5

 
18

 
15

Energy Trading
4

 
12

 
2

 
14

Corporate and Other (a)
(14
)
 
72

 
(28
)
 
55

Net Income Attributable to DTE Energy
$
146

 
$
202

 
$
302

 
$
378


_____________________________
(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.