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Financings and Capitalization (Narrative) (Details) (Consumers Energy Company [Member], USD $) | 12 Months Ended
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Dec. 31, 2011
Short-term Securities [Member] |
Maximum limitation on outstanding securities | $ 1,000,000,000
Remaining availability | 700,000,000
Expiration date of authorizations | June 30, 2012
Long-term Securities [Member] |
Maximum limitation on outstanding securities | 2,500,000,000
Remaining availability | $ 1,400,000,000
Expiration date of authorizations | June 30 2012

X
- Definition Amount of debt remaining available to issue under regulatory authorization. + References No definition available. + Details
Name: | cms_AvailableDebtToIssueUnderRegulatoryAuthorization
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of debt which can be issued under regulatory authorization. + References No definition available. + Details
Name: | cms_RegulatoryAuthorizationToIssueDebtSecurities
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Date when the regulatory debt authorization is scheduled to expire + References No definition available. + Details
Name: | cms_RegulatoryDebtAuthorizationExpirationDate
Namespace Prefix: | cms_
Data Type: | invest:dateStringItemType
Balance Type: | na
Period Type: | duration