Earnings Per Share - CMS Energy (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share - CMS Energy [Abstract]

Basic And Diluted EPS Computations

In Millions, Except Per Share Amounts
Three Months Ended March 31	2013			2012
Income available to common stockholders
Income from continuing operations available to    common stockholders – basic and diluted		$	144		$	60
Average common shares outstanding
Weighted-average shares – basic			263.6			255.6
Add dilutive contingently convertible securities			6.1			10.4
Add dilutive non-vested stock awards			1.2			0.8
Weighted-average shares – diluted			270.9			266.8
Income from continuing operations per average
common share available to common stockholders
Basic		$	0.55		$	0.23
Diluted			0.53			0.22