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Earnings Per Share - CMS Energy (Basic and Diluted EPS Computation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income from Continuing Operations | $ 41 | $ 140 | $ 101 | $ 133 | $ 31 |  | $ 146 |  | $ 100 |  | $ 89 |  | $ 415 | $ 366 | $ 220
Less Income Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 3 | 11
Less charge for deferred issuance cost of preferred stock |  |  |  |  |  |  | 8 |  |  |  |  |  | 0 | 8 | 0
Less Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 | 11
Income from Continuing operations available to common stockholders basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  | 413 | 347 | 198
Weighted average shares basic |  |  |  |  |  |  |  |  |  |  |  |  | 250.8 | 231.5 | 227.2
Add dilutive contingently convertible securities |  |  |  |  |  |  |  |  |  |  |  |  | 12.2 | 21.3 | 10.6
Add dilutive Non vested awards and options |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 | 0.1 | 0.1
Weighted average shares - diluted |  |  |  |  |  |  |  |  |  |  |  |  | 263.4 | 252.9 | 237.9
Basic | $ 0.16 | $ 0.55 | $ 0.40 | $ 0.53 | $ 0.13 | [1] | $ 0.58 | [1] | $ 0.42 | [1] | $ 0.38 | [1] | $ 1.65 | $ 1.50 | $ 0.87
Diluted | $ 0.15 | $ 0.53 | $ 0.38 | $ 0.51 | $ 0.11 | [1] | $ 0.53 | [1] | $ 0.39 | [1] | $ 0.35 | [1] | $ 1.57 | $ 1.36 | $ 0.83
CMS Energy Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |  | 415 | 350 | 229
Less charge for deferred issuance cost of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8 |
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