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Notes Receivable (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule Of Current And Non-Current Notes Receivable |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2018 | December 31, 2017 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |
﻿Current |  |  |  |  |  |  |
﻿EnerBank notes receivable, net of allowance for loan losses |  | $ | 181 |  | $ | 178 |
﻿EnerBank notes receivable held for sale |  |  | 2 |  |  | 2 |
﻿Michigan tax settlement |  |  | 20 |  |  | 20 |
﻿Non-current |  |  |  |  |  |  |
﻿EnerBank notes receivable |  |  | 1,167 |  |  | 1,171 |
﻿Total notes receivable |  | $ | 1,370 |  | $ | 1,371 |
﻿Consumers |  |  |  |  |  |  |
﻿Current |  |  |  |  |  |  |
﻿Michigan tax settlement |  | $ | 17 |  | $ | 17 |
﻿Total notes receivable |  | $ | 17 |  | $ | 17 |
﻿
Consumers Energy Company [Member] |
Schedule Of Current And Non-Current Notes Receivable |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2018 | December 31, 2017 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |
﻿Current |  |  |  |  |  |  |
﻿EnerBank notes receivable, net of allowance for loan losses |  | $ | 181 |  | $ | 178 |
﻿EnerBank notes receivable held for sale |  |  | 2 |  |  | 2 |
﻿Michigan tax settlement |  |  | 20 |  |  | 20 |
﻿Non-current |  |  |  |  |  |  |
﻿EnerBank notes receivable |  |  | 1,167 |  |  | 1,171 |
﻿Total notes receivable |  | $ | 1,370 |  | $ | 1,371 |
﻿Consumers |  |  |  |  |  |  |
﻿Current |  |  |  |  |  |  |
﻿Michigan tax settlement |  | $ | 17 |  | $ | 17 |
﻿Total notes receivable |  | $ | 17 |  | $ | 17 |
﻿

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=cms_ConsumersEnergyCompanyMember
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Data Type: | na
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Period Type: |