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Stock-Based Compensation (Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Weighted Average Grant Date Fair Value) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-Average Grant Date Fair Value per Share, Granted | $ 16.65 | [1] |  |
Consumers Energy Company [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-Average Grant Date Fair Value per Share, Granted | $ 16.76 | [1] |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-Average Grant Date Fair Value per Share, Granted | $ 16.65 |  | $ 12.32 | $ 13.89
Restricted Stock [Member] | Consumers Energy Company [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-Average Grant Date Fair Value per Share, Granted | $ 16.76 |  | $ 12.28 | $ 14.17
[1] | During 2013, CMS Energy granted 326,518 TSR shares, 271,250 time-lapse shares, 45,486 shares from dividends paid on TSR shares, and 277,333 shares granted as a result of the outcome of the TSR awards’ market condition. During 2013, Consumers granted 310,454 TSR shares, 264,283 time-lapse shares, 43,450 shares from dividends paid on TSR shares, and 260,963 shares granted as a result of the outcome of the TSR awards’ market condition.

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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
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- Details
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