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Notes Receivable (Tables) | 6 Months Ended
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Jun. 30, 2013
Schedule Of Current And Non-Current Notes Receivable |
In Millions
| June 30, 2013 | December 31, 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
EnerBank notes receivable, net of allowance for loan losses |  | $ | 50 |  | $ | 40 |
Other |  |  | 26 |  |  | 1 |
Non-current |  |  |  |  |  |  |
EnerBank notes receivable, net of allowance for loan losses |  |  | 493 |  |  | 504 |
Other |  |  | - |  |  | 16 |
Total notes receivable |  | $ | 569 |  | $ | 561 |
Consumers |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
Other |  | $ | 25 |  | $ | - |
Non-current |  |  |  |  |  |  |
Other |  |  | - |  |  | 16 |
Total notes receivable |  | $ | 25 |  | $ | 16 |
Schedule Of Allowance For Loan Losses |
In Millions
| Three Months Ended |  | Six Months Ended |
June 30 | 2013 | 2012 |  | 2013 | 2012 |
Balance at beginning of period |  | $ | 5 |  | $ | 5 |  |  | $ | 5 |  | $ | 5 |
Charge-offs |  |  | (2) |  |  | (1) |  |  |  | (3) |  |  | (2) |
Recoveries |  |  | 1 |  |  | - |  |  |  | 1 |  |  | - |
Provision for loan losses |  |  | 1 |  |  | 1 |  |  |  | 2 |  |  | 2 |
Balance at end of period |  | $ | 5 |  | $ | 5 |  |  | $ | 5 |  | $ | 5 |
Consumers Energy Company [Member] |
Schedule Of Current And Non-Current Notes Receivable |
In Millions
| June 30, 2013 | December 31, 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
EnerBank notes receivable, net of allowance for loan losses |  | $ | 50 |  | $ | 40 |
Other |  |  | 26 |  |  | 1 |
Non-current |  |  |  |  |  |  |
EnerBank notes receivable, net of allowance for loan losses |  |  | 493 |  |  | 504 |
Other |  |  | - |  |  | 16 |
Total notes receivable |  | $ | 569 |  | $ | 561 |
Consumers |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
Other |  | $ | 25 |  | $ | - |
Non-current |  |  |  |  |  |  |
Other |  |  | - |  |  | 16 |
Total notes receivable |  | $ | 25 |  | $ | 16 |

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- Definition Tabular disclosure of current and non-current notes receivable. + References No definition available. + Details
Name: | cms_ScheduleOfCurrentAndNonCurrentNotesReceivableTableTextBlock
Namespace Prefix: | cms_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the activity in the total allowance for credit losses related to financing receivables (such as loans or lease receivables) for entities that have an unclassified balance sheet, including the balance in the allowance at the beginning and end of each period, additions charged to operations, direct write-downs charged against the allowance, and recoveries of amounts previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
Name: | us-gaap_ScheduleOfCreditLossesRelatedToFinancingReceivablesCurrentAndNoncurrentTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration