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Earnings Per Share - CMS Energy (Basic And Diluted EPS Computations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Earnings Per Share - CMS Energy [Abstract] |  |  |  |
Income From continuing operations | $ 127 | $ 149 | $ 352 | $ 310
Income attributable to noncontrolling interests | 1 | 1 | 2 | 2
Income from Continuing operations available to common stockholders basic and diluted | $ 126 | $ 148 | $ 350 | $ 308
Weighted average shares - basic | 264.8 | 262.9 | 264.3 | 259.9
Add dilutive contingently convertible securities | 6.2 | 5.1 | 6.2 | 7.2
Add dilutive non-vested awards | 1.0 | 1.0 | 1.1 | 1.0
Weighted average shares - diluted | 272.0 | 269.0 | 271.6 | 268.1
Basic | $ 0.48 | $ 0.56 | $ 1.32 | $ 1.18
Diluted | $ 0.46 | $ 0.55 | $ 1.29 | $ 1.14

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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