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Earnings Per Share - CMS Energy (Basic and Diluted EPS Computation) (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Earnings Per Share - CMS Energy |  |  |  |
Income from Continuing Operations | $ 101 | $ 100 | $ 234 | $ 189
Less Income Attributable to Noncontrolling Interest | 1 | 2 | 1 | 2
Less Preferred Stock Dividends |  | 2 |  | 5
Income from Continuing operations available to common stockholders basic and diluted | $ 100 | $ 96 | $ 233 | $ 182
Weighted average shares basic | 250.3 | 228.2 | 250.2 | 228.1
Add dilutive contingently convertible securities | 11.3 | 19.3 | 11.0 | 19.5
Add dilutive Non vested awards and options | 0.3 | 0.1 | 0.3 | 0.1
Weighted average shares - diluted | 261.9 | 247.6 | 261.5 | 247.7
Basic | $ 0.40 | $ 0.42 | $ 0.93 | $ 0.80
Diluted | $ 0.38 | $ 0.39 | $ 0.89 | $ 0.74

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