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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share - CMS Energy [Abstract]        
Income from continuing operations $ 149 $ 140 $ 310 $ 374
Less income attributable to noncontrolling interest 1 1 2 2
Income from Continuing Operations Available to Common Stockholders - Basic and Diluted $ 148 $ 139 $ 308 $ 372
Weighted average shares - basic 262.9 251.3 259.9 250.5
Add dilutive contingently convertible securities 5.1 11.3 7.2 11.4
Add dilutive non-vested awards and options 1.0 0.6 1.0 0.4
Add dilutive convertible debentures   0.7    
Weighted average shares - diluted 269.0 263.9 268.1 262.3
Basic $ 0.56 $ 0.55 $ 1.18 $ 1.48
Diluted $ 0.55 $ 0.53 $ 1.14 $ 1.42