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Segment Information
 12 Months Ended
Dec. 31, 2011
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 MBT provision 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. See Note 12 for a discussion of the MCIT, which replaced the MBT effective January 1, 2012. 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 power sales, gas sales and coal transportation services in the following segments:
 
2011
 
2010
 
2009
 
(In millions)
Electric Utility
$
33

 
$
30

 
$
28

Gas Utility
2

 
—

 
2

Gas Storage and Pipelines
8

 
4

 
5

Power and Industrial Projects
238

 
161

 
11

Energy Trading
70

 
89

 
93

Corporate and Other
(50
)
 
(65
)
 
(74
)
 
$
301

 
$
219

 
$
65


Financial data of the business segments follows:
 
Operating
Revenue
 
Depreciation,
Depletion &
Amortization
 
Interest
Income
 
Interest
Expense
 
Income
Taxes
 
Net Income
Attributable
to DTE
Energy
Company
 
Total
Assets
 
Goodwill
 
Capital
Expenditures
 
(In millions)
2011
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric Utility
$
5,154

 
$
818

 
$
(1
)
 
$
289

 
$
265

 
$
434

 
$
17,370

 
$
1,208

 
$
1,203

Gas Utility
1,505

 
89

 
(7
)
 
64

 
60

 
110

 
3,933

 
745

 
179

Gas Storage and Pipelines
91

 
6

 
(5
)
 
7

 
35

 
57

 
421

 
22

 
16

Unconventional Gas Production
39

 
18

 
—

 
7

 
(3
)
 
(6
)
 
319

 
2

 
29

Power and Industrial Projects
1,129

 
60

 
(8
)
 
32

 
11

 
38

 
1,210

 
26

 
56

Energy Trading
1,276

 
3

 
—

 
9

 
34

 
52

 
552

 
17

 
1

Corporate and Other
4

 
1

 
(47
)
 
144

 
(134
)
 
26

 
2,204

 
—

 
—

Reconciliation and Eliminations
(301
)
 
—

 
58

 
(58
)
 
(1
)
 
—

 
—

 
—

 
—

Total
$
8,897

 
$
995

 
$
(10
)
 
$
494

 
$
267

 
$
711

 
$
26,009

 
$
2,020

 
$
1,484

 
Operating
Revenue
 
Depreciation,
Depletion &
Amortization
 
Interest
Income
 
Interest
Expense
 
Income
Taxes
 
Net Income
Attributable
to DTE
Energy
Company
 
Total
Assets
 
Goodwill
 
Capital
Expenditures
 
(In millions)
2010
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric Utility
$
4,993

 
$
849

 
$
(1
)
 
$
313

 
$
270

 
$
441

 
$
16,375

 
$
1,206

 
$
864

Gas Utility
1,648

 
92

 
(9
)
 
66

 
67

 
127

 
3,854

 
759

 
147

Gas Storage and Pipelines
83

 
5

 
(1
)
 
6

 
32

 
51

 
391

 
9

 
5

Unconventional Gas Production
32

 
15

 
—

 
6

 
(6
)
 
(11
)
 
308

 
2

 
27

Power and Industrial Projects
1,144

 
60

 
(3
)
 
33

 
3

 
85

 
1,236

 
27

 
53

Energy Trading
875

 
5

 
—

 
13

 
5

 
6

 
483

 
17

 
1

Corporate and Other
1

 
1

 
(47
)
 
160

 
(60
)
 
(69
)
 
2,249

 
—

 
—

Reconciliation and Eliminations
(219
)
 
—

 
49

 
(48
)
 
—

 
—

 
—

 
—

 
—

Total
$
8,557

 
$
1,027

 
$
(12
)
 
$
549

 
$
311

 
$
630

 
$
24,896

 
$
2,020

 
$
1,097

 
Operating
Revenue
 
Depreciation,
Depletion &
Amortization
 
Interest
Income
 
Interest
Expense
 
Income
Taxes
 
Net Income
Attributable
to DTE
Energy
Company
 
Total
Assets
 
Goodwill
 
Capital
Expenditures
 
(In millions)
2009
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric Utility
$
4,714

 
$
844

 
$
(1
)
 
$
324

 
$
228

 
$
376

 
$
15,879

 
$
1,206

 
$
794

Gas Utility
1,788

 
107

 
(8
)
 
68

 
39

 
80

 
3,832

 
759

 
166

Gas Storage and Pipelines
82

 
5

 
(1
)
 
10

 
33

 
49

 
367

 
9

 
2

Unconventional Gas Production
31

 
16

 
—

 
6

 
(4
)
 
(9
)
 
309

 
2

 
26

Power and Industrial Projects
661

 
40

 
(3
)
 
30

 
(7
)
 
31

 
1,118

 
31

 
45

Energy Trading
804

 
5

 
(1
)
 
10

 
37

 
75

 
552

 
17

 
2

Corporate & Other
—

 
3

 
(55
)
 
147

 
(79
)
 
(70
)
 
2,138

 
—

 
—

Reconciliation and Eliminations
(66
)
 
—

 
50

 
(50
)
 
—

 
—

 
—

 
—

 
—

Total
$
8,014

 
$
1,020

 
$
(19
)
 
$
545

 
$
247

 
$
532

 
$
24,195

 
$
2,024

 
$
1,035