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Earnings Per Share - CMS Energy (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share - CMS Energy [Abstract] |
Basic And Diluted EPS Computations |
In Millions, Except Per Share Amounts
| Three Months Ended |  | Nine Months Ended |
September 30 | 2013 | 2012 |  | 2013 | 2012 |
Income available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 127 |  | $ | 149 |  |  | $ | 352 |  | $ | 310 |
Less income attributable to noncontrolling interests |  |  | 1 |  |  | 1 |  |  |  | 2 |  |  | 2 |
Income from continuing operations available to common stockholders – basic and diluted |  | $ | 126 |  | $ | 148 |  |  | $ | 350 |  | $ | 308 |
Average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 stock awards |  |  | 1.0 |  |  | 1.0 |  |  |  | 1.1 |  |  | 1.0 |
Weighted-average shares – diluted |  |  | 272.0 |  |  | 269.0 |  |  |  | 271.6 |  |  | 268.1 |
Income from continuing operations per average |  |  |  |  |  |  |  |  |  |  |  |  |  |
common share available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.48 |  | $ | 0.56 |  |  | $ | 1.32 |  | $ | 1.18 |
Diluted |  |  | 0.46 |  |  | 0.55 |  |  |  | 1.29 |  |  | 1.14 |

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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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