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Leases (Tables) (Consumers Energy Company [Member]) | 12 Months Ended
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Dec. 31, 2011
Consumers Energy Company [Member] |
Schedule of Rent Expense |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
|  | In Millions |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
PPA operating lease expense |  | $ | 10 |  |  | $ | 5 |  |  | $ | 9 |
Non-PPA operating lease expense |  |  | 22 |  |  |  | 22 |  |  |  | 23 |
Contingent rental expense 1 |  |  | 11 |  |  |  | 14 |  |  |  | 9 |
1 | Contingent rental expense comprises PPA energy and capacity payments and any other payments not associated with RECs. This expense is excluded from operating lease expense.
Schedule of Future Minimum Lease Payments for Leases | Presented in the following table are the minimum annual rental commitments under Consumers' non-cancelable leases at December 31, 2011. All of CMS Energy's non-cancelable leases at December 31, 2011 were attributable to Consumers.
|  | Capital Leases |  |  | Finance Lease1 |  |  | Operating Leases |
|  | In Millions |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
2012 |  | $ | 20 |  |  | $ | 20 |  |  | $ | 27 |
2013 |  |  | 13 |  |  |  | 20 |  |  |  | 24 |
2014 |  |  | 11 |  |  |  | 19 |  |  |  | 22 |
2015 |  |  | 12 |  |  |  | 18 |  |  |  | 22 |
2016 |  |  | 8 |  |  |  | 17 |  |  |  | 17 |
2017 and thereafter |  |  | 39 |  |  |  | 79 |  |  |  | 68 |
Total minimum lease payments |  | $ | 103 |  |  | $ | 173 |  |  | $ | 180 |
Less imputed interest |  |  | 46 |  |  |  | 39 |  |  |  |  |
Present value of net minimum lease payments |  | $ | 57 |  |  | $ | 134 |  |  |  |  |
Less current portion |  |  | 11 |  |  |  | 13 |  |  |  |  |
Non-current portion |  | $ | 46 |  |  | $ | 121 |  |  |  |  |
1 | In 2007, Consumers sold Palisades to Entergy and entered into a 15-year PPA to buy all of the capacity and energy then capable of being produced by Palisades. Consumers has continuing involvement with Palisades through security provided to Entergy for Consumers' PPA obligation and other arrangements. Because of these ongoing arrangements, Consumers accounted for the transaction as a financing of Palisades and not a sale. Accordingly, no gain on the sale of Palisades was recognized on the consolidated statements of income. Consumers accounted for the remaining non-real-estate assets and liabilities associated with the transaction as a sale. Palisades remains on Consumers' consolidated balance sheets and Consumers continues to depreciate it. Consumers recorded the related proceeds as a finance obligation with payments recorded to interest expense and the finance obligation based on the amortization of the obligation over the life of the Palisades PPA. The value of the finance obligation was determined based on an allocation of the transaction proceeds to the fair values of the net assets sold and fair value of the plant asset under the financing. Total amortization and interest charges under the financing were $21 million, $22 million, and $23 million respectively, for the years ended December 31, 2011, 2010, and 2009.

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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, for capital, finance, and operating leases, and the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References No definition available. + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 840 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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