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Segment Information (Notes)
 6 Months Ended
Jun. 30, 2013
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 segment consists principally of DTE Electric, 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 segment consists of DTE Gas and Citizens.  DTE Gas 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.

Power and Industrial Projects is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial and institutional customers; produce reduced emissions fuel (REF) 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 state and local income tax provisions of the utility subsidiaries is determined on an individual company basis and recognizes the tax benefit of various tax credits and net operating losses if applicable. The subsidiaries record federal, state and local income taxes payable to or receivable from DTE Energy based on the federal, state and local 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 fuel, power sales, natural gas sales and coal transportation services in the following segments:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2013
 
2012
 
2013
 
2012
 
(In millions)
Inter-segment Revenues
 
 
 
 
 
 
 
Electric
$
7

 
$
8

 
$
13

 
$
15

Gas
1

 
1

 
2

 
2

Gas Storage and Pipelines
2

 
3

 
4

 
4

Power and Industrial Projects
185

 
192

 
390

 
383

Energy Trading
12

 
10

 
23

 
24

Corporate and Other
(7
)
 
(7
)
 
(15
)
 
(17
)
 
$
200

 
$
207

 
$
417

 
$
411


Financial data of the business segments follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2013
 
2012
 
2013
 
2012
 
(In millions)
Operating Revenues
 
 
 
 
 
 
 
Electric
$
1,265

 
$
1,290

 
$
2,484

 
$
2,488

Gas
248

 
214

 
852

 
723

Gas Storage and Pipelines
31

 
27

 
58

 
52

Power and Industrial Projects
429

 
449

 
919

 
898

Energy Trading
451

 
239

 
844

 
500

Corporate & Other
1

 
1

 
1

 
2

Reconciliation & Eliminations
(200
)
 
(207
)
 
(417
)
 
(411
)
Total
$
2,225

 
$
2,013

 
$
4,741

 
$
4,252

 
 
 
 
 
 
 
 
Net Income (Loss) Attributable to DTE Energy by Segment:
 
 
 
 
 
 
 
Electric
$
89

 
$
127

 
$
204

 
$
223

Gas
8

 
4

 
104

 
56

Gas Storage and Pipelines
16

 
17

 
33

 
34

Power and Industrial Projects
7

 
10

 
19

 
18

Energy Trading
(2
)
 
4

 
5

 
2

Corporate & Other
(13
)
 
(15
)
 
(26
)
 
(30
)
Discontinued operations
—

 
(1
)
 
—

 
(1
)
Net Income Attributable to DTE Energy
$
105

 
$
146

 
$
339

 
$
302