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Segment Information
 3 Months Ended
Mar. 31, 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:
 
Three Months Ended
 
March 31
 
2012
 
2011
 
(In millions)
Electric Utility
$
7

 
$
9

Gas Utility
1

 
—

Gas Storage and Pipelines
1

 
2

Power and Industrial Projects
191

 
26

Energy Trading
14

 
22

Corporate and Other
(10
)
 
(17
)
 
$
204

 
$
42



Financial data of the business segments follows:

 
Three Months Ended
 
March 31
(In millions)
2012
 
2011
Operating Revenues
 
 
 
Electric Utility
$
1,198

 
$
1,193

Gas Utility
509

 
689

Gas Storage and Pipelines
25

 
25

Unconventional Gas Production
10

 
8

Power and Industrial Projects
449

 
235

Energy Trading
261

 
322

Corporate & Other
1

 
1

Reconciliation & Eliminations
(204
)
 
(42
)
Total
$
2,249

 
$
2,431

Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
Electric Utility
$
96

 
$
85

Gas Utility
52

 
83

Gas Storage and Pipelines
17

 
15

Unconventional Gas Production
(1
)
 
(2
)
Power and Industrial Projects
8

 
10

Energy Trading
(2
)
 
2

Corporate & Other
(14
)
 
(17
)
Net Income Attributable to DTE Energy
$
156

 
$
176