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Regulatory Matters (Schedule of Components of the Increase in Revenue) (Details) (Electric Rate Case [Member], Consumers Energy Company [Member], USD $) In Millions | Jun. 30, 2011
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Annual Rate Increase Requested by Consumers | $ 195
Investment in Rate Base [Member] |
Annual Rate Increase Requested by Consumers | 81
Recovery Of Depreciation And Property Taxes [Member] |
Annual Rate Increase Requested by Consumers | 70
Impact Of Sales Declines [Member] |
Annual Rate Increase Requested by Consumers | 50
Reduced Operating And Maintenance Costs [Member] |
Annual Rate Increase Requested by Consumers | (4)
Cost Of Capital [Member] |
Annual Rate Increase Requested by Consumers | $ (2)

X
- Definition The annual rate increase requested by Consumers. + Details
Name: | cms_AnnualRateIncreaseRequested
Namespace Prefix: | cms
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant