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Discontinued Operations Discontinued Operations (Tables)
3 Months Ended
Mar. 31, 2013
Discontinued Operations [Abstract]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
 
Three Months Ended
 
March 31,
 
2012
 
(In millions)
Operating Revenues
$
10

 
 
Operation and Maintenance
5

Depreciation, Depletion and Amortization
5

Taxes Other Than Income

Asset (Gains) and Losses, Net

Operating Income

Other (Income) and Deductions
1

Income Tax Benefit
(1
)
Net Income Attributable to DTE Energy Company
$