Earnings Per Share - CMS Energy (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share - CMS Energy [Abstract]

Basic and Diluted EPS Computation

Years Ended December 31	2011		2010		2009
Income Available to Common Stockholders
Income from continuing operations	$	415	$	366	$	220
Less income attributable to noncontrolling interests		2		3		11
Less charge for deferred issuance costs on preferred stock		-		8		-
Less preferred stock dividends		-		8		11
Income from Continuing Operations Available to Common Stockholders – Basic and Diluted	$	413	$	347	$	198
Average Common Shares Outstanding
Weighted average shares – basic		250.8		231.5		227.2
Add dilutive contingently convertible securities		12.2		21.3		10.6
Add dilutive non-vested stock awards and options		0.4		0.1		0.1
Weighted average shares – diluted		263.4		252.9		237.9
Income from Continuing Operations per Average Common Share Available to Common Stockholders
Basic	$	1.65	$	1.50	$	0.87
Diluted		1.57		1.36		0.83

Schedule of Potential Impacts on the Calculation of Diluted EPS using the If-Converted Method

Years Ended December 31	2011		2010		2009
Increase to numerator from assumed reduction in interest expense	$	1	$	1	$	5
Increase to denominator from assumed conversion of debentures into common shares		0.7		0.7		2.3