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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current notes receivable	$ 73	$ 41
Total notes receivable	567	561
Consumers Energy Company [Member]
Current notes receivable	25
Total notes receivable	25	16
EnerBank [Member]
Current notes receivable	47	40
Noncurrent notes receivable	494	504
Other [Member]
Current notes receivable	26	1
Noncurrent notes receivable		16
Other [Member] \| Consumers Energy Company [Member]
Current notes receivable	25
Noncurrent notes receivable		$ 16

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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