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Earnings Per Share - CMS Energy (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share - CMS Energy [Abstract] |
Basic And Diluted EPS Computations |
In Millions, Except Per Share Amounts
| Three Months Ended |  | Six Months Ended |
June 30 | 2013 | 2012 |  | 2013 | 2012 |
Income available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 81 |  | $ | 101 |  |  | $ | 225 |  | $ | 161 |
Less income attributable to noncontrolling interests |  |  | 1 |  |  | 1 |  |  |  | 1 |  |  | 1 |
Income from continuing operations available to common stockholders – basic and diluted |  | $ | 80 |  | $ | 100 |  |  | $ | 224 |  | $ | 160 |
Average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares – basic |  |  | 264.5 |  |  | 261.2 |  |  |  | 264.1 |  |  | 258.4 |
Add dilutive contingently convertible securities |  |  | 6.4 |  |  | 5.9 |  |  |  | 6.2 |  |  | 8.3 |
Add dilutive non-vested stock awards |  |  | 1.3 |  |  | 1.1 |  |  |  | 1.2 |  |  | 1.0 |
Weighted-average shares – diluted |  |  | 272.2 |  |  | 268.2 |  |  |  | 271.5 |  |  | 267.7 |
Income from continuing operations per average |  |  |  |  |  |  |  |  |  |  |  |  |  |
common share available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.30 |  | $ | 0.38 |  |  | $ | 0.85 |  | $ | 0.61 |
Diluted |  |  | 0.29 |  |  | 0.37 |  |  |  | 0.83 |  |  | 0.59 |

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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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