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Earnings Per Share - CMS Energy (Tables) | 3 Months Ended
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Mar. 31, 2014
Earnings Per Share - CMS Energy [Abstract] |
Basic And Diluted EPS Computations |
In Millions, Except Per Share Amounts
Three Months Ended March 31 | 2014 | 2013 |
Income available to common stockholders |  |  |  |  |  |  |
Income from continuing operations available to common stockholders – basic and diluted |  | $ | 204 |  | $ | 144 |
Average common shares outstanding |  |  |  |  |  |  |
Weighted-average shares – basic |  |  | 266.1 |  |  | 263.6 |
Add dilutive contingently convertible securities |  |  | 6.3 |  |  | 6.1 |
Add dilutive non-vested stock awards |  |  | 0.6 |  |  | 1.2 |
Weighted-average shares – diluted |  |  | 273.0 |  |  | 270.9 |
Income from continuing operations per average |  |  |  |  |  |  |
common share available to common stockholders |  |  |  |  |  |  |
Basic |  | $ | 0.77 |  | $ | 0.55 |
Diluted |  |  | 0.75 |  |  | 0.53 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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