Earnings Per Share - CMS Energy (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share - CMS Energy [Abstract]

Basic And Diluted EPS Computations

In Millions, Except Per Share Amounts
Years Ended December 31	2012			2011			2010
Income available to common stockholders
Income from continuing operations		$	377		$	415		$	366
Less income attributable to noncontrolling interests			2			2			3
Less charge for deferred issuance costs on preferred stock			-			-			8
Less preferred stock dividends			-			-			8
Income from continuing operations available to    common stockholders – basic and diluted		$	375		$	413		$	347
Average common shares outstanding
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 stock awards and options			1.1			0.4			0.1
Weighted-average shares – diluted			268.6			263.4			252.9
Income from continuing operations per average
common share available to common stockholders
Basic		$	1.43		$	1.65		$	1.50
Diluted			1.39			1.57			1.36

Schedule Of Potential Impacts On The Calculation Of Diluted EPS Using The If-Converted Method

In Millions
Years Ended December 31	2012			2011			2010
Increase to numerator from assumed reduction in interest expense		$	-		$	1		$	1
Increase to denominator from assumed conversion of debentures    into common shares			0.1			0.7			0.7