Other Impairments and Restructuring	12 Months Ended
Other Impairments and Restructuring	Dec. 31, 2011
Other Impairments and Restructuring [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	OTHER IMPAIRMENTS AND RESTRUCTURING Other Impairments — Barnett Shale Our Unconventional Gas Production segment recorded pre-tax impairment losses of $1 million, $10 million and $6 million in 2011, 2010 and 2009, respectively. The impairments related primarily to the write-off of expired or expiring leasehold positions that the Company does not intend to drill. Restructuring Costs In 2005, the Company initiated a company-wide review of its operations called the Performance Excellence Process. The Company incurred CTA restructuring expense. In September 2006, the MPSC issued an order approving a settlement agreement that allowed Detroit Edison and MichCon, commencing in 2006, to defer the incremental CTA. Further, the order provided for Detroit Edison and MichCon to amortize the CTA deferrals over a ten-year period beginning with the year subsequent to the year the CTA was deferred. The recovery of these costs for Detroit Edison was provided for by the MPSC in the order approving the settlement in the show cause proceeding and in the December 23, 2008 MPSC rate order. Detroit Edison amortized deferred CTA costs of $18 million in 2011, 2010 and 2009. The September 2006 order did not provide a regulatory recovery mechanism for MichCon, therefore MichCon expensed CTA incurred during the period 2006 through 2008. The June 2010 MPSC order provided for MichCon’s recovery of the regulatory unamortized balance of CTA. At June 30, 2010, MichCon deferred and recognized in income approximately $32 million ($20 million after-tax) of previously expensed CTA. The non-pension component of CTA of approximately $21 million is included in Regulatory assets. The pension component of CTA of approximately $11 million is included in Regulatory liabilities. MichCon amortized approximately $3 million and $2 million of deferred CTA costs in 2011 and 2010, respectively. Amounts expensed are recorded in Operation and maintenance expense on the Consolidated Statements of Operations. Deferred amounts are recorded in Regulatory assets and Regulatory liabilities on the Consolidated Statements of Financial Position. See Note 11.

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

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