Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Income Taxes (Textuals) [Abstract]
Bonus Depreciation Provision		50.00%
Decrease In Deferred Tax Assets			$ 56
Net Regulatory Tax Assets Recorded			35
Decrease In Net Income			$ 21
Increased Bonus Depreciation		100.00%
Indiana Current Tax Rate	8.50%
Michigan Corporate Net Income Tax Rate	6.00%

Bonus depreciation provision provided by Economic Stimulus Act of 2008.

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Current state tax rate in Indiana, which is scheduled for a 0.5 reduction each year beginning June 30, 2012.

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Decrease in deferred tax assets as a result of Patient Protection and Affordable Care Act (Health Care Acts) enacted in March 2010.

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Net change in Net Income resulting from Health Care Acts enactment.

Income Taxes.

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Temporary increase to bonus depreciation as provided by the Small Business Jobs Act.

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Represents net income tax rate which replaced the Business Tax regime in Michigan.

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Partial offset to decrease in deferred tax assets resulting from Health Care Acts.

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