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Earnings Per Share - CMS Energy (Basic And Diluted EPS Computations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share - CMS Energy [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income From Continuing Operations | $ 67 | $ 149 | $ 101 | $ 60 | $ 41 |  | $ 140 |  | $ 101 |  | $ 133 |  | $ 377 | $ 415 | $ 366
Less income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 3
Less charge for deferred issuance cost of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8
Less Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8
Income from Continuing Operations Available to Common Stockholders - Basic and Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 375 | $ 413 | $ 347
Weighted average shares - basic |  |  |  |  |  |  |  |  |  |  |  |  | 260.7 | 250.8 | 231.5
Add dilutive contingently convertible securities |  |  |  |  |  |  |  |  |  |  |  |  | 6.8 | 12.2 | 21.3
Add dilutive non-vested awards and options |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | 0.4 | 0.1
Weighted average shares - diluted |  |  |  |  |  |  |  |  |  |  |  |  | 268.6 | 263.4 | 252.9
Basic | $ 0.26 | $ 0.56 | $ 0.38 | $ 0.23 | $ 0.16 | [1] | $ 0.55 | [1] | $ 0.40 | [1] | $ 0.53 | [1] | $ 1.43 | $ 1.65 | $ 1.50
Diluted | $ 0.25 | $ 0.55 | $ 0.37 | $ 0.22 | $ 0.15 | [1] | $ 0.53 | [1] | $ 0.38 | [1] | $ 0.51 | [1] | $ 1.39 | $ 1.57 | $ 1.36
[1] | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.

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