XML 160 R113.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Stock-Based Compensation (Schedule Of Restricted Stock Granted) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 841,413
Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 801,235
Time-Lapsed Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 188,303
Time-Lapsed Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 180,958
Market-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 185,464
Market-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 175,818
Performance-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 185,464
Performance-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 175,818
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 15,338
Restricted Stock Units (RSUs) [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 14,907
Time-Lapsed Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 14,595
Time-Lapsed Restricted Stock Units [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 14,186
Dividends On Market-Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 38,652
Dividends On Market-Based Awards [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 36,646
Dividends On Performance-Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 14,438
Dividends On Performance-Based Awards [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 13,704
Dividends On Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 743
Dividends On Restricted Stock Units [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 721
Additional Market-Based Shares Based On Achievement Of Condition [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 213,754
Additional Market-Based Shares Based On Achievement Of Condition [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 203,384

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cms_ConsumersEnergyCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_TimeLapsedRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_MarketBasedRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_TimeLapsedRestrictedStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_DividendsOnMarketBasedAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_DividendsOnPerformanceBasedAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_DividendsOnRestrictedStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=cms_AdditionalMarketBasedSharesBasedOnAchievementOfConditionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |