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Notes Receivable (Tables) | 3 Months Ended
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Mar. 31, 2016
Notes Receivable [Abstract] |
Schedule Of Current And Non-Current Notes Receivable |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2016 | December 31, 2015 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |
﻿Current |  |  |  |  |  |  |
﻿EnerBank notes receivable, net of allowance for loan losses |  | $ | 135 |  | $ | 128 |
﻿EnerBank notes receivable held for sale |  |  | 16 |  |  | 16 |
﻿Non-current |  |  |  |  |  |  |
﻿EnerBank notes receivable |  |  | 1,024 |  |  | 1,017 |
﻿Total notes receivable |  | $ | 1,175 |  | $ | 1,161 |
﻿

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- Definition Notes Receivable [Abstract] + References No definition available. + Details
Name: | cms_NotesReceivableAbstract
Namespace Prefix: | cms_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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