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Asset Sales, Discontinued Operations, and Impairment Charges (Impairment Charges) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended
	Dec. 31, 2010	May 31, 2010	Dec. 31, 2010
Exeter [Member]
Investment Carrying Value Prior To Asset Impairment	$ 11		$ 11
Investment Fair Value	5		5
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax			6
Deferred Coal-Fueled Power Plant [Member] \| Consumers Energy Company [Member]
Megawatt Capacity			830
Public Utilities, Property, Plant and Equipment, Amount of Loss (Recovery) on Plant Abandonment	$ 19	$ 3	$ 22

Pretax provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a pretax (gain) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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- Definition

The amount of loss or recovery of loss related to a plant abandonment. If the carrying amount of the abandoned plant exceeds the present value of future cost recoveries through the rate making process, a loss is recognized. Such charges do not meet the requirements of an extraordinary item.

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