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Leases (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Rent Expense |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
Consumers
Minimum operating lease expense |  |  |  |  |  |  |  |  |  |
PPAs |  | $ | 6 |  | $ | 10 |  | $ | 5 |
Other agreements |  |  | 23 |  |  | 22 |  |  | 22 |
Contingent rental expense1 |  |  | 33 |  |  | 11 |  |  | 14 |
1 Contingent rental expense is related to capital and operating lease PPAs.
Schedule of Future Minimum Lease Payments for Leases |
In Millions
| Capital Leases | Finance Lease1 | Operating Leases |
Consumers |  |  |  |  |  |  |  |  |  |
2013 |  | $ | 14 |  | $ | 20 |  | $ | 26 |
2014 |  |  | 13 |  |  | 19 |  |  | 25 |
2015 |  |  | 14 |  |  | 18 |  |  | 24 |
2016 |  |  | 10 |  |  | 17 |  |  | 19 |
2017 |  |  | 9 |  |  | 17 |  |  | 19 |
2018 and thereafter |  |  | 36 |  |  | 62 |  |  | 67 |
Total minimum lease payments |  | $ | 96 |  | $ | 153 |  | $ | 180 |
Less imputed interest |  |  | 43 |  |  | 31 |  |  |  |
Present value of net minimum lease payments |  | $ | 53 |  | $ | 122 |  |  |  |
Less current portion |  |  | 9 |  |  | 13 |  |  |  |
Non-current portion |  | $ | 44 |  | $ | 109 |  |  |  |
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.
Consumers Energy Company [Member] |
Schedule of Rent Expense |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
Consumers
Minimum operating lease expense |  |  |  |  |  |  |  |  |  |
PPAs |  | $ | 6 |  | $ | 10 |  | $ | 5 |
Other agreements |  |  | 23 |  |  | 22 |  |  | 22 |
Contingent rental expense1 |  |  | 33 |  |  | 11 |  |  | 14 |
1 Contingent rental expense is related to capital and operating lease PPAs.
Schedule of Future Minimum Lease Payments for Leases |
In Millions
| Capital Leases | Finance Lease1 | Operating Leases |
Consumers |  |  |  |  |  |  |  |  |  |
2013 |  | $ | 14 |  | $ | 20 |  | $ | 26 |
2014 |  |  | 13 |  |  | 19 |  |  | 25 |
2015 |  |  | 14 |  |  | 18 |  |  | 24 |
2016 |  |  | 10 |  |  | 17 |  |  | 19 |
2017 |  |  | 9 |  |  | 17 |  |  | 19 |
2018 and thereafter |  |  | 36 |  |  | 62 |  |  | 67 |
Total minimum lease payments |  | $ | 96 |  | $ | 153 |  | $ | 180 |
Less imputed interest |  |  | 43 |  |  | 31 |  |  |  |
Present value of net minimum lease payments |  | $ | 53 |  | $ | 122 |  |  |  |
Less current portion |  |  | 9 |  |  | 13 |  |  |  |
Non-current portion |  | $ | 44 |  | $ | 109 |  |  |  |
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.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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