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Stock-Based Compensation (Schedule Of Restricted Stock Granted) (Details) | 12 Months Ended
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Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 802,782
Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 763,099
Time-Lapsed Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 152,820
Time-Lapsed Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 146,536
Market-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 158,385
Market-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 149,909
Performance-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 158,385
Performance-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 149,909
Time-Lapsed Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 12,848
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 | 12,514
Dividends On Market-Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 22,208
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 | 21,129
Dividends On Performance-Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 11,046
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 | 10,502
Dividends On Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 332
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 | 323
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 | 286,758
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 | 272,277

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- 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
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