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Notes Receivable (Current and Non-Current) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current notes receivable	$ 40	$ 49
Noncurrent notes receivable	461	462
Total notes receivable	501	511
Consumers Energy Company [Member]
Current notes receivable	13	23
Noncurrent notes receivable	1	1
Total notes receivable	14	24
EnerBank USA [Member]
Current notes receivable	26	19
Noncurrent notes receivable	460	461
Other [Member]
Current notes receivable	14	30
Noncurrent notes receivable	$ 1	$ 1

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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