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Cash And Cash Equivalents (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Schedule Of Cash And Cash Equivalents, Including Restricted Amounts |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31 | December 31 |
﻿ | 2018 | 2017 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |
﻿Cash and cash equivalents |  | $ | 195 |  | $ | 182 |
﻿Restricted cash and cash equivalents |  |  | 26 |  |  | 17 |
﻿Other non-current assets |  |  | 6 |  |  | 5 |
﻿Cash and cash equivalents, including restricted amounts |  | $ | 227 |  | $ | 204 |
﻿Consumers |  |  |  |  |  |  |
﻿Cash and cash equivalents |  | $ | 115 |  | $ | 44 |
﻿Restricted cash and cash equivalents |  |  | 26 |  |  | 17 |
﻿Other non-current assets |  |  | 5 |  |  | 4 |
﻿Cash and cash equivalents, including restricted amounts |  | $ | 146 |  | $ | 65 |
﻿
Consumers Energy Company [Member] |
Schedule Of Cash And Cash Equivalents, Including Restricted Amounts |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31 | December 31 |
﻿ | 2018 | 2017 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |
﻿Cash and cash equivalents |  | $ | 195 |  | $ | 182 |
﻿Restricted cash and cash equivalents |  |  | 26 |  |  | 17 |
﻿Other non-current assets |  |  | 6 |  |  | 5 |
﻿Cash and cash equivalents, including restricted amounts |  | $ | 227 |  | $ | 204 |
﻿Consumers |  |  |  |  |  |  |
﻿Cash and cash equivalents |  | $ | 115 |  | $ | 44 |
﻿Restricted cash and cash equivalents |  |  | 26 |  |  | 17 |
﻿Other non-current assets |  |  | 5 |  |  | 4 |
﻿Cash and cash equivalents, including restricted amounts |  | $ | 146 |  | $ | 65 |
﻿

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- Definition Tabular disclosure of the components of cash and cash equivalents, including restricted amounts. + References No definition available. + Details
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- Details
Name: | dei_LegalEntityAxis=cms_ConsumersEnergyCompanyMember
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Data Type: | na
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