Earnings Per Share - CMS Energy (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share - CMS Energy [Abstract]

Basic And Diluted EPS Computations

In Millions, Except Per Share Amounts
	Three Months Ended						Six Months Ended
June 30	2013			2012			2013			2012
Income available to common stockholders
Income from continuing operations		$	81		$	101		$	225		$	161
Less income attributable to noncontrolling interests			1			1			1			1
Income from continuing operations available to    common stockholders – basic and diluted		$	80		$	100		$	224		$	160
Average common shares outstanding
Weighted-average shares – basic			264.5			261.2			264.1			258.4
Add dilutive contingently convertible securities			6.4			5.9			6.2			8.3
Add dilutive non-vested stock awards			1.3			1.1			1.2			1.0
Weighted-average shares – diluted			272.2			268.2			271.5			267.7
Income from continuing operations per average
common share available to common stockholders
Basic		$	0.30		$	0.38		$	0.85		$	0.61
Diluted			0.29			0.37			0.83			0.59