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v2.4.1.9

Significant Accounting Policies (Details) | 12 Months Ended
--- | ---
Dec. 31, 2014
Minimum [Member] |
Regulatory Liabilities [Line Items] |
Same as cash, fee recognition period | 3 months
Authorized contractor, fee recognition period | 1 year
Maximum [Member] |
Regulatory Liabilities [Line Items] |
Financial incentive as percentage of energy optimization program spending | 15.00%cms_FinancialIncentiveAsPercentageOfEnergyOptimizationProgramSpending / us-gaap_RangeAxis = us-gaap_MaximumMember
Energy optimization spending limit | 2.00%cms_EnergyOptimizationSpendingLimit / us-gaap_RangeAxis = us-gaap_MaximumMember
Same as cash, fee recognition period | 24 months
Authorized contractor, fee recognition period | 12 years

X
- Definition Authorized contractor, fee recognition period + References No definition available. + Details
Name: | cms_AuthorizedContractorFeeRecognitionPeriod
Namespace Prefix: | cms_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The limit, as a percentage of retail revenue, of energy optimization program spending. + References No definition available. + Details
Name: | cms_EnergyOptimizationSpendingLimit
Namespace Prefix: | cms_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financial incentive as percentage of energy optimization program spending + References No definition available. + Details
Name: | cms_FinancialIncentiveAsPercentageOfEnergyOptimizationProgramSpending
Namespace Prefix: | cms_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Same as cash, fee recognition period + References No definition available. + Details
Name: | cms_SameAsCashFeeRecognitionPeriod
Namespace Prefix: | cms_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryLiabilitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |